Jeffrey Miron and Laura Nicolae
In recent decades, U.S. marijuana laws have liberalized substantially. Recreational marijuana use is now legal in
10 states and the District of Columbia, and many more states have
legalized marijuana for medical use. In response, legalization opponents
have claimed that marijuana use increases crime, violence and schizophrenia.
So is marijuana legalization good policy? Yes.
Recent research casts
doubt on alarmist claims about the effects of recent state-level
marijuana legalization. By looking at the pre- and post-legalization
trends in outcomes such as marijuana use, other drug or alcohol use,
marijuana prices, crime and traffic accidents, it becomes clear that
state-level marijuana legalization has been associated with, at most,
modest changes in these outcomes.
The absence of significant adverse
consequences is especially striking given the dire predictions made by
some legalization opponents.
In addition, economic logic suggests that drug prohibition, whether
for marijuana or any other drug, is misguided. Drug use entails risk for
some users, and use sometimes harms innocent third parties. But the
adverse effects of prohibition are far worse.
Little evidence suggests
that prohibition reduces drug use. Instead, prohibition breeds black
markets and pushes consumers into illicit drug use, which is far more
dangerous than legal consumption.
Drug quality control is poor in
underground markets because reliable suppliers cannot legally advertise
their goods and consumers cannot sue for damages due to faulty or
mislabeled products.
Drugs obtained from underground markets do not come
with warning labels, and users cannot discuss safe use with their
physicians, making them more likely to combine drugs with alcohol or
other medications that suppress respiration.
Legalization opponents claim that drugs increase violent or criminal
tendencies, but any association between drugs and violence arises mainly
from prohibition’s impact on drug markets. Throughout the 20th century,
major fluctuations in the U.S. homicide rate have been positively associated with
fluctuations in the enforcement of drug and alcohol prohibition.
Prohibition raises drug prices, which motivates some consumers to commit
crimes to fund their drug use.
Under prohibition, drug-related disputes between users and suppliers,
such as those over faulty or mislabeled products, are more likely to be
settled with violence since they cannot be tried in court.
Prohibition
also decreases the
marginal cost of committing a crime; a marijuana supplier who already
evades the law has little incentive to obey the law in other instances.
The Mexican drug war has also been linked to increases in homicide as captures of kingpins motivate rival gangs to exploit weakened organizations.
In addition, prohibition is expensive; the War on Drugs costs taxpayers around $50 billion annually,
in addition to leaving a similar amount of tax revenue in the
underground market.
Prohibition reallocates law enforcement away from
responding to violent offenses and increases civil liberties violations
as police pursue perpetrators of victimless crimes.
The War on Drugs contributes to racial profiling and other racial disparities in law enforcement. Although black and white Americans use marijuana at roughly equal rates, blacks are nearly four times as likely to be arrested for marijuana possession. Prosecutors pursue mandatory minimum sentences for black defendants at twice the rate as
for white defendants charged with the same offense. Criminalizing
nonviolent and largely victimless behavior grants law enforcement
substantial discretion in the interpretation and application of the law.
Prohibition has cost American taxpayers more than $1 trillion and
has been largely ineffective in decreasing marijuana use. Worse,
prohibition has created new risks to health and safety and has increased
the incentive to engage in violence or crime. We should look forward to
continued legalization of marijuana at the state and federal level.
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