In response to the CDC's recommendations that women who are both sexually active and capable of having a child not drink alcohol unless they use birth control, and the resulting angry backlash from some quarters, Sarah Longwell, the managing director of the American Beverage Institute, wrote an article that has appeared in multiple outlets, such as the Des Moines Register. She claims in the article that, although the CDC's recommendations are aimed at preventing fetal alcohol spectrum disorders, "achieving this worthy public health goal shouldn’t require women to suddenly stop drinking and having sex. And expecting women to take that advice is utterly unrealistic."
First, before I debunk her column, I would like to provide some background on the American Beverage Institute: it is a lobbying organization that fights against alcohol control policies like lowering blood alcohol limits, increasing alcohol prices, and ignition interlock systems in cars.
The first assertion she makes is attacking a straw man: the CDC's recommendations were not that women who are sexually active and drinking alcohol stop doing at least one of them, but rather that they stop drinking alcohol if they are sexually active and not using birth control. She goes on to misrepresent the CDC's recommendations again in the column, falsely claiming that they recommended that because "fertile women could have a baby at any time; ladies, either put down your light beer or stop having sex."
Anyway, she then discusses whether the US even has a drinking problem, saying: "While medical bodies, including the American Academy of Pediatrics, say “no amount of alcohol is safe during pregnancy,” many individual doctors suggest a glass of wine or two during pregnancy isn’t an issue. University of Chicago economist Emily Oster reviewed hundreds of academic studies and ignited a firestorm when she authored a book arguing that occasional drinking during pregnancy (1-2 drinks per week in the first trimester, 1 daily thereafter) isn’t problematic." What she doesn't mention is that since Oster's book was published in 2013, many other studies have been published, the overall effect of which has been to cloud the issue. Some of these studies have found that light drinking during pregnancy has adverse effects.
She then criticizes the CDC because, and I quote:
"Every year, the CDC generates splashy headlines about how “excessive drinking” is costing our economy billions of dollars each year and that “one in three adults drinks excessively.”"
The thing is, it's not just the CDC who is concerned about this problem in America: the World Health Organization said in 2014 that in 2010, about 23% of men and 11% of women in America were problem drinkers.
She goes on to criticize the CDC's definitions of heavy drinking (>15 drinks/week for men and >8/week for women) and states that:
"There is a clear difference between an adult who enjoys two glasses of wine with dinner and one who chronically consumes several bottles. However, targeting policy recommendations to those with alcohol abuse problems isn’t in the CDC’s wheelhouse."
What she doesn't mention is that 90% of people who drink excessively are not alcoholics.
So what are the policies the CDC recommends that Longwell disapproves of? Let's ask her:
"The CDC advocates for higher alcohol taxes, though the National Institute on Alcohol Abuse and Alcoholism reports that alcohol tax increases had no effect on the 5 percent of consumers who are the heaviest drinkers. Instead, higher prices encourage moderate drinkers to cut back and heavy drinkers to switch to cheaper brands."
Not true (at least if she's saying these taxes don't work, which seems to be what she's implying). A 2010 review showed that increasing the price of alcohol, including through taxes, significantly reduced alcohol-related mortality and injury, and suggested that "doubling the alcohol tax would reduce alcohol-related mortality by an average of 35%, traffic crash deaths by 11%, sexually transmitted disease by 6%, violence by 2%, and crime by 1.4%."
Lastly, I will focus on her argument about lowering the blood alcohol limit, as promoted by the CDC:
"The agency also recommends states lower the legal blood alcohol concentration (BAC) limit for driving from .08 to .05 percent. The average BAC for a drunk driver involved in a fatal crash is .15 — nearly twice the current legal limit. If setting the limit at .08 hasn’t stopped these heavily intoxicated drivers from getting behind the wheel, .05 is unlikely to succeed. Even Mothers Against Drunk Driving doesn’t think .05 is the answer."
Well, the problem with the statement that "setting the limit at .08 hasn’t stopped these heavily intoxicated drivers from getting behind the wheel" is that it implies that because some laws are often broken by people, the laws don't work. In fact, contrary to Longwell's implication, studies show that lowering the BAC limit at 0.08% has saved lives. One study from before every state had a BAC limit of 0.08 (as is the case now) found that "It all states adopted 0.08% legal blood alcohol limits, at least 500 to 600 fewer fatal crashes would occur annually." Another study from four years later put the number at between 400 and 500.
I can't help but notice that the arguments made by this employee of an alcohol industry lobbying organization is making similar arguments to organizations lobbying on behalf of the gun industry: "don't target law-abiding citizens, target the criminals! Criminals don't follow the law, so making it stricter won't stop crimes!" Of course, this totally ignores the fact that if you extend this argument to any horrific act, it could be used to "debunk" the imposition of any law banning such an act, because criminals will just disobey it anyway. The arguments made by Longwell don't make any more sense, and her arguments about there being a distinction between some people who drink 15 drinks/week and others reek of special pleading.
Need to understand a controversial human biology/genetics/psychology topic? You've come to the right place! That's because I know everything there is to know about everything and am uniquely endowed with the ability to perfectly describe EVERY science topic. What? Sarcasm? I don't even know what that is!
Thursday, February 11, 2016
Saturday, February 6, 2016
A brief note on Heather Mac Donald, mass incarceration, and crime
Last October, Heather Mac Donald published a column in both the Wall Street Journal and City Journal arguing that mass incarceration isn't a problem in America, and that our crime rate is the real problem we should be focusing on. I would like to point out something that makes one of the arguments in it with respect to mass incarceration and crime totally bogus. The following is a quote from the City Journal version of the column:
American crime rates are comparable to those of other Western countries.
Lastly, I will take on Mac Donald's claim about how "the American prison system is driven by violent crime." I would like to reiterate what I said in a previous post: a 2014 report by the National Research Council found that, rather than rising crime rates, “The increase in U.S. incarceration rates over the past 40 years is preponderantly the result of increases both in the likelihood of imprisonment and in lengths of prison sentences.” Here's another quote from the same report that Mac Donald and anyone who supports her might do well to read (emphasis mine): "...the growth in incarceration rates beginning in 1973 was preceded for about a decade by a very large increase in crime rates. Incarceration rates showed their strongest period of growth in the 1980s, as violent crime fell through the first half of the decade and then increased in the second. Incarceration rates continued to climb through the 1990s as the violent crime rate began to fall. Finally, in the 2000s, crime rates have remained stable at a low level, while the incarceration rate peaked in 2007, and the incarcerated population peaked in 2010. Thus the very high rates of incarceration that emerged over the past decades cannot simply be ascribed to a higher level of crime today compared with the early 1970s, when the prison boom began."
The critics of “mass incarceration” love to compare American incarceration rates unfavorably with European ones. Crime is inevitably left out of the analysis. Jeremy Travis and Nicholas Turner, head of the John Jay College of Criminal Justice and the Vera Institute, respectively, penned a classic treatment of this theme in the New York Times in August 2015. Germany’s incarceration rate is one-tenth that of the U.S., they fumed. “To be sure,” they acknowledged, “there are significant differences between the two countries.” And might those “significant differences” have anything to do with crime, perhaps with the fact that the U.S. rate of gun homicide is about 17 times higher than that of Germany? Of course not. No, for Travis and Turner, the key difference is that “America’s criminal justice system was constructed in slavery’s long shadow and is sustained today by the persistent forces of racism.” The same people who denounce American gun violence and call for gun control in a domestic context go silent about gun violence when using Europe as a club to cudgel the American prison system. The U.S. homicide rate is seven times higher than the combined rate of 21 Western developed nations plus Japan, according to a 2011 study by researchers of the Harvard School of Public Health and the UCLA School of Public Health. This disparity is largely fueled by the American firearm homicide rate: 19.5 times higher than in the comparison high-income countries, according to 2003 data. Among 15- to 24-year-olds, Americans kill with guns at nearly 43 times the rate of their counterparts in those same industrialized nations. Since the American prison system is driven by violent crime, it is not surprising that America’s incarceration rate is higher than Europe’s.Actually, contrary to Mac Donald's claims, America's overall crime rates are comparable to those of other developed countries, but American crime is much more lethal than that in other such countries. Also, Mac Donald is wrong about opponents of mass incarceration leaving out the crime rate in America from this discussion: This video, citing the International Crime Victims Survey, makes the point that
American crime rates are comparable to those of other Western countries.
Lastly, I will take on Mac Donald's claim about how "the American prison system is driven by violent crime." I would like to reiterate what I said in a previous post: a 2014 report by the National Research Council found that, rather than rising crime rates, “The increase in U.S. incarceration rates over the past 40 years is preponderantly the result of increases both in the likelihood of imprisonment and in lengths of prison sentences.” Here's another quote from the same report that Mac Donald and anyone who supports her might do well to read (emphasis mine): "...the growth in incarceration rates beginning in 1973 was preceded for about a decade by a very large increase in crime rates. Incarceration rates showed their strongest period of growth in the 1980s, as violent crime fell through the first half of the decade and then increased in the second. Incarceration rates continued to climb through the 1990s as the violent crime rate began to fall. Finally, in the 2000s, crime rates have remained stable at a low level, while the incarceration rate peaked in 2007, and the incarcerated population peaked in 2010. Thus the very high rates of incarceration that emerged over the past decades cannot simply be ascribed to a higher level of crime today compared with the early 1970s, when the prison boom began."
Sunday, January 31, 2016
The pros and cons of expanding Medicaid
In 2012, the Supreme Court ruled that Obamacare's provision requiring states to expand Medicaid to cover almost everyone making <138% of the federal poverty level, as opposed to the groups it originally covered: "only low-income children, parents, pregnant women, and disabled persons." As of January 14 of this year, 31 states and Washington D.C. have decided to expand Medicaid, while the rest have chosen not to. In this post, I will discuss the arguments for and against expanding Medicaid.
The pros:
1. Since the federal government has promised to pay for "100 percent [of this cost] for the first three years, and then declining gradually to no less than 90 percent in future years," if this promise is kept, the states will have to pay for at most only 10% of the cost of expansion.
2. A 2012 study found that "State Medicaid expansions to cover low-income adults were significantly associated with reduced mortality as well as improved coverage, access to care, and self-reported health." Another more recent study found that "The ACA Medicaid expansion has the potential to improve a wide variety of coverage, access, financial, and health outcomes for uninsured parents in states that choose to expand coverage."
3. If you choose not to expand Medicaid, your state may end up like Texas, which is eschewing $100 billion of federal money over a decade by doing so, and not insuring over a million people. In addition, the state is spending $5.5 billion per year treating the uninsured, which is being covered by "taxes and insurance premiums paid by the state's businesses and residents, who are also footing the bill for expanding Medicaid in 29 states and the District of Columbia that agreed to accept federal funds to offer coverage to nearly all poor adults."
The cons:
1. The key word in the first statement is "if": some conservatives have argued that the next congress might change this provision by "decid[ing] to fund Syrian refugees and foreign worker visas rather than Medicaid" or, if the Fed raises interest rates, "raid[ing] Medicaid and get a few extra billion for interest payments."
2. Doctors don't get paid as much for seeing Medicaid patients as they do for seeing Medicare patients. Obamacare fixed this by requiring doctors to get paid the same amount for seeing either type of patient, but this fix was temporary, and beginning in 2015, according to the Urban Institute, primary care doctors' Medicaid payments declined by 43%. This led to many doctors not seeing as many Medicaid patients. As the Federalist argued in 2014, "Too often the current Medicaid program denies patients access to care, since about 40 percent of primary care doctors do not even accept Medicaid patients because the reimbursements are so low."
3. Another argument is that, in line with point 2 above, according to Alan Reynolds of the Cato Institute, "Medicare reimbursement rates are far too low to cover the costs of high-quality medical services, and Medicaid reimbursement is even worse."
4. Another big argument is that the costs of Medicaid borne by the states, although only 10% of the total, are still substantial, and that costs have been much higher than anticipated for the states that have expanded.
5. Medicaid is ineffective at improving health outcomes. This claim is generally based on the Oregon Medicaid experiment, the results of which were published in lots of different journals, including the New England Journal of Medicine in 2013. This study concluded that "...Medicaid coverage generated no significant improvements in measured physical health outcomes in the first 2 years, but it did increase use of health care services, raise rates of diabetes detection and management, lower rates of depression, and reduce financial strain."
5. Medicaid is ineffective at improving health outcomes. This claim is generally based on the Oregon Medicaid experiment, the results of which were published in lots of different journals, including the New England Journal of Medicine in 2013. This study concluded that "...Medicaid coverage generated no significant improvements in measured physical health outcomes in the first 2 years, but it did increase use of health care services, raise rates of diabetes detection and management, lower rates of depression, and reduce financial strain."
Now to debunk the "cons":
1. This is mere speculation: the only way states would have to pay >10% of the costs more than 3 years after the expansion would be if "Congress passed a law to change the ratio." Also, as the New York Times Editorial Board noted, despite GOP concerns that the federal government might back off from paying 90%, "there is no reason to believe that will happen, and if it does, it can be resolved when it arises."
2. Putting this claim to the test would require looking at states that have expanded Medicaid and seeing whether more or fewer people are being seen by doctors. As it happens, the Oregon Medicaid experiment (you know, the one cited as proof "Medicaid doesn’t actually improve health outcomes") debunked this claim: one of its authors said that "We can eliminate the story that Medicaid is so lousy you can’t get in to see a doctor" because in the study, "People who gained access to Medicaid did use more health care".
3. According to the Urban Institute, revenues of hospitals in states that expanded Medicaid would be expected to "increase [by] nearly $300 billion over the 2013-2022 period – a 23% increase in Medicaid reimbursement for hospitals." Besides that, as noted in the point just above this one, people on Medicaid "did use more health care" in the Oregon experiment, and the 2012 study cited in point 2 in the "Pros" section reached similar conclusions.
4. In reality, it costs more not to expand Medicaid than to expand it. The Kaiser Family Foundation found that states (and Washington DC) "that didn't broaden coverage saw their Medicaid costs rise 6.9 percent in the fiscal year that ended Sept. 30. The 29 states that took President Obama up on his offer to foot the bill for expanding Medicaid saw their costs rise only 3.4 percent." Similarly, a 2013 RAND study found that the 14 states that had, at the time, announced their intention not to expand Medicaid actually refused to do so, they would "collectively will spend $1 billion more on uncompensated care in 2016 than they would if Medicaid is expanded." In part this is because states like Texas that refuse to expand Medicaid still have to spent money ($5.5 billion per year for Texas alone) treating the uninsured--money that the state has to cover with taxes rather than taking billions it from the federal government.
5. See the 2012 study above--you know, the one that found that "State Medicaid expansions to cover low-income adults were significantly associated with reduced mortality as well as improved coverage, access to care, and self-reported health", linked here again for your convenience. Now, it's true that the Oregon study reached the opposite conclusion w/respect to outcomes. But this may not mean that Medicaid expansion doesn't work, because the same study found that such expansion was associated with increased "rates of diabetes detection and management, and it reduced observed rates of depression by 30 percent." There are also some limitations to this study, including that it "measured only three health indicators — blood-pressure, cholesterol and glycated hemoglobin levels (which measure diabetic blood sugar control) — and only over a two-year period." Another study estimated that "Medicaid expansion in [Texas] would have resulted in 184,192 fewer depression diagnoses, 62,610 fewer individuals suffering catastrophic medical expenditures, and between 1,840 and 3,035 fewer deaths."
In short, every state that has refused to expand Medicaid should do so as soon as possible, and, as Jon Stewart put it, there's only one real reason to refuse to do so: spite against President Obama.
4. In reality, it costs more not to expand Medicaid than to expand it. The Kaiser Family Foundation found that states (and Washington DC) "that didn't broaden coverage saw their Medicaid costs rise 6.9 percent in the fiscal year that ended Sept. 30. The 29 states that took President Obama up on his offer to foot the bill for expanding Medicaid saw their costs rise only 3.4 percent." Similarly, a 2013 RAND study found that the 14 states that had, at the time, announced their intention not to expand Medicaid actually refused to do so, they would "collectively will spend $1 billion more on uncompensated care in 2016 than they would if Medicaid is expanded." In part this is because states like Texas that refuse to expand Medicaid still have to spent money ($5.5 billion per year for Texas alone) treating the uninsured--money that the state has to cover with taxes rather than taking billions it from the federal government.
5. See the 2012 study above--you know, the one that found that "State Medicaid expansions to cover low-income adults were significantly associated with reduced mortality as well as improved coverage, access to care, and self-reported health", linked here again for your convenience. Now, it's true that the Oregon study reached the opposite conclusion w/respect to outcomes. But this may not mean that Medicaid expansion doesn't work, because the same study found that such expansion was associated with increased "rates of diabetes detection and management, and it reduced observed rates of depression by 30 percent." There are also some limitations to this study, including that it "measured only three health indicators — blood-pressure, cholesterol and glycated hemoglobin levels (which measure diabetic blood sugar control) — and only over a two-year period." Another study estimated that "Medicaid expansion in [Texas] would have resulted in 184,192 fewer depression diagnoses, 62,610 fewer individuals suffering catastrophic medical expenditures, and between 1,840 and 3,035 fewer deaths."
In short, every state that has refused to expand Medicaid should do so as soon as possible, and, as Jon Stewart put it, there's only one real reason to refuse to do so: spite against President Obama.
Monday, January 18, 2016
Everything you know about Prohibition is wrong
It is very hard to find articles about Prohibition, or even
tangentially mentioning it, that don't explicitly say one or both of two
things:
The two links above are just a drop in the bucket--there are
countless other examples of news articles claiming the exact same things. The
problem is that both of these premises are either largely or totally wrong.
First of all, Prohibition
did lower alcohol consumption. Not only that, but
"The lowered level of consumption during
the quarter century following Repeal, together with the large minority of
abstainers, suggests that Prohibition did socialize or maintain a significant
portion of the population in temperate or abstemious [not self-indulgent]
habits." Even libertarian economist Jeffrey Miron, along with
Jeffrey Zwiebel, estimates that shortly after Prohibition became law in 1920, alcohol consumption fell to about 30%
of its pre-Prohibition level, albeit temporarily (it
increased to 60-70% of this level over the next few years). By other estimates
(by Miron and Angela Dills), prohibition reduced
cirrhosis by about 10-20%.
As for crime, according to a 2006 paper by Jack Blocker, "Although organized crime flourished under its sway, Prohibition was not
responsible for its appearance, as organized crime’s post-Repeal persistence
has demonstrated."
So why does it matter whether Prohibition failed
or not? Because, as the aforementioned 2006 paper points out, "Arguments
that assume that Prohibition was a failure have been deployed most effectively
against laws prohibiting tobacco and guns, but they have been ignored by those
waging the war on other drugs since the 1980s, which is directed toward the
same teetotal goal as National Prohibition." Yet that does not mean people
haven't argued that since Alcohol Prohibition was a failure, drug prohibition
was too. Take the Drug Policy Alliance, which on December 5, 2013, the 80th
anniversary of the repeal of Prohibition, announced that "Eighty years
ago today, the Twenty-first Amendment to the Constitution was ratified and
alcohol Prohibition was officially repealed. If you only know one thing about
Prohibition, it's probably the fact that it was a tremendous
failure. Making alcohol illegal led to huge increases in organized crime,
corruption, and violence." This argument, however, is founded on a false assumption, because as Blocker notes, "Simplistic assumptions about government’s ability to legislate morals, whether pro or con, find no support in the historical record."
So does this mean prohibition would work if we reinstated it now?
Sort of: according to Wayne Hall of the University
of Queensland, "It is incorrect to claim that the US experience of National Prohibition
indicates that prohibition as a means of regulating alcohol is always doomed to
failure. Subsequent experience shows that partial prohibitions can produce
substantial public health benefits at an acceptable social cost, in the absence
of substantial enforcement."
Now you’re doubtless wondering what “partial prohibitions”
are. So was I when I first read the above paper. Apparently, under
partial prohibition of a drug, it is legal to possess and use it for nonmedical
purposes, or to import, produce, and cultivate it for your personal use, or
possibly to give a small amount of it as a gift, or to sell small amounts of it,
to someone else. Under this paradigm, it would still be illegal to import,
produce, or cultivate the drug for the purpose of distribution (as opposed to
personal use), to commercially distribute the drug for nonmedical reasons, or to
drive while under its influence.
This seems like the way alcohol is treated now, except that companies can produce and distribute it for commercial purposes. The really appealing part, though, is that this policy encourages:
These two ideas seem to balance the desire to reduce the adverse effects of drug use and avoid stigmatizing and/or arresting and/or imprisoning people who use such drugs.
This seems like the way alcohol is treated now, except that companies can produce and distribute it for commercial purposes. The really appealing part, though, is that this policy encourages:
- Permitting a simultaneous medical, educational, religious, and parental effort to concentrate on reducing irresponsible use and remedying its consequences, and
- Removing the criminal stigma and the threat of incarceration from a widespread behavior (possession for personal use) which does not warrant such treatment.
These two ideas seem to balance the desire to reduce the adverse effects of drug use and avoid stigmatizing and/or arresting and/or imprisoning people who use such drugs.
Wednesday, January 6, 2016
Gun background checks and the "gun show loophole"
The following recommendation was made by a number of American organizations earlier this year: "[We] strongly support requiring criminal background checks for all firearm purchases, including sales by gun dealers, sales at gun shows, and private sales between individuals. Although current laws require background checks at gun stores, purchases at gun shows do not require such checks. This loophole must be closed."
Which organizations do you think were behind this recommendation? If you guessed a gun control advocacy group like Everytown for Gun Safety, you were wrong. It was actually made by 8 professional medical organizations: American Academy of Family Physicians, American Academy of Pediatrics, American College of Emergency Physicians, American Congress of Obstetricians and Gynecologists, American College of Physicians, American College of Surgeons, and American Psychiatric Association, and the American Public Health Association. Also on board is the American Bar Association, which informs us that this and other recommendations do not conflict with the Second Amendment. You can read the whole text of the recommendations here.
Among the politicians who have endorsed the "closing the "gun show loophole"" recommendation made by the above organizations is Hillary Clinton.
So are they right? Is there a "gun show loophole"? And if so, how important is it to close it as far as reducing gun violence is concerned? In this blog post, I will try to answer the above questions, as well as another: "Would expanding background checks reduce gun violence?"
First of all, it needs to be made clear that the phrase "gun show loophole" applies to more than just gun shows. According to Daniel Webster of Johns Hopkins University, "If you're not a licensed dealer and want to sell a gun directly to somebody, then you don't need to run a background check. Some people call this the "gun show loophole," but it applies to all private sales—including, for example, those that take place over the internet."
Yet there are those who claim that the "gun show loophole" doesn't exist. For instance, Politico claimed earlier this year that, contrary to Bernie Sanders' claims, "the "gun show" loophole doesn't actually exist. There's nothing in particular about gun shows that allows otherwise illegal gun sales to occur. Sanders instead is referring to an exclusion in the gun laws that does not require a background check in a private sale. It doesn't matter if that sale is at the seller's home or at a gun show, a background check is not legally required."
They have a point, but not in the way they want their readers to think: the "gun show loophole", although its name is somewhat misleading, does exist. So how is its name misleading? It suggests that the way background checks work is as shown in the chart below (Yes/No refers to whether a background check is required for such sales):
In fact, as Vox discussed recently, it works more like the chart below:
The above situation arises because if you are a private gun dealer, you can be unlicensed because "the law does not require a dealer’s license for private hobbyists and others who occasionally buy and sell guns for the purpose of enhancing or liquidating a collection." In contrast, if you repeatedly sell guns mainly to make money, you do need a license, regardless of whether you sell them in a store, at a show, or online. This matters because all licensed gun dealers must conduct background checks.
So now we've established that there is a loophole as regards gun background checks, but it's not properly called the "gun show loophole" but the "private sales loophole." Now we can move on to the question of whether increased background checks would save lives.
On this front, there is some evidence the answer might be yes, but studies supporting this conclusion have often acknowledged that there could just be correlation, not causation. For instance:
They have a point, but not in the way they want their readers to think: the "gun show loophole", although its name is somewhat misleading, does exist. So how is its name misleading? It suggests that the way background checks work is as shown in the chart below (Yes/No refers to whether a background check is required for such sales):
Licensed gun dealership (e.g. store)
|
Gun show
|
|
Licensed gun dealer
|
Yes
|
No
|
Unlicensed private gun dealer
|
Yes
|
No
|
| Licensed gun dealership (e.g. store) | Gun show | Online sales | Home sales | |
| Licensed gun dealer | Yes | Yes | Yes | Yes |
| Unlicensed/private gun dealer | N/A | No | No | No |
So now we've established that there is a loophole as regards gun background checks, but it's not properly called the "gun show loophole" but the "private sales loophole." Now we can move on to the question of whether increased background checks would save lives.
On this front, there is some evidence the answer might be yes, but studies supporting this conclusion have often acknowledged that there could just be correlation, not causation. For instance:
- Sen et al.: "More extensive background checks prior to gun purchase are mostly associated with reductions in firearm homicide and suicide deaths. Several study limitations are acknowledged, and further research is called for to ascertain causality."
- Ruddell et al.: "...states with less stringent background checks on firearms purchases were significantly associated with firearms homicides."
Another study said that the best way to conduct background checks is at the local level, or, to wit, "Using local-level agencies to perform firearm background checks is associated with reduced rates of firearm suicide and homicide."
To be fair, there are studies showing that background checks don't work, as in the case of the Brady Act of 1994. A 2000 study showed that "Based on the assumption that the greatest reductions in fatal violence would be within states that were required to institute waiting periods and background checks, implementation of the Brady Act appears to have been associated with reductions in the firearm suicide rate for persons aged 55 years or older but not with reductions in homicide rates or overall suicide rates. However, the pattern of implementation of the Brady Act does not permit a reliable analysis of a potential effect of reductions in the flow of guns from treatment-state gun dealers into secondary markets."
In other words, it's possible that the Brady Act only failed because it didn't affect all states, rather than the more obvious conclusion, that strict gun laws don't work.
Also, here's a fun fact: background checks prevent some people with extensive criminal records from buying handguns, but not those whose record consists only of minor offenses, despite the fact that such people are at a much higher risk of committing crimes than others. This suggests that expanding background checks not in terms of which sales they cover but in terms of who they prevent from buying a gun may be a good idea.
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