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Legalizing Medical Marijuana Doesn’t Cause Crime, New Study Shows

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In Texas, the association between marijuana and crime goes back more than a century. One hundred years ago, the state made marijuana use illegal, and it remains that way both for recreational and medical purposes today.

Some have argued legalization poses a threat to public health and safety. But new research led by UT Dallas published this month in the journalPLoS Oneshows no rise in crime rates following medical marijuana legalization and in fact, a possible reduction in homicide and assault rates.

Robert G. Morris, associate professor of criminology and director of the Center for Crime & Justice Studies at UT Dallas conducted the study.

Main Medical Marijuana Legalization Fears:

  1. If you legalize marijuana there is more available in the community and if people use marijuana more they’re more likely to use other drugs associated with crime. The “gateway” theory.
  2. If medical marijuana is legalized, there will be dispensaries that could be the potential targets of crime, either attempts to steal the product or cash.

The Findings

“The main finding was that there was no increase in crime following legalization of marijuana for medical purposes,” Morris says, “And in fact some models suggest that reductions occurred for crimes including homicide and assault.”

You can read the full study in the journal PLoS One.

Why There Might Be A Reduction In Crime

One of the arguments, Morris says, has to do with alcohol use.

“Some studies have shown when medical marijuana becomes available legally we have reductions in alcohol misuse, and since we have an association between alcohol misuse and crime, when people substitute the marijuana for the alcohol the crime that would have followed declines.”

Morris plans to conduct more research to study the effect on crime following the legalization of recreational use of marijuana in the states of Colorado and Washington.

Lauren Silverman was the Health, Science & Technology reporter/blogger at KERA News. She was also the primary backup host for KERA’s Think and the statewide newsmagazine  Texas Standard. In 2016, Lauren was recognized as Texas Health Journalist of the Year by the Texas Medical Association. She was part of the Peabody Award-winning team that covered Ebola for NPR in 2014. She also hosted "Surviving Ebola," a special that won Best Long Documentary honors from the Public Radio News Directors Inc. (PRNDI). And she's won a number of regional awards, including an honorable mention for Edward R. Murrow award (for her project “The Broken Hip”), as well as the Texas Veterans Commission’s Excellence in Media Awards in the radio category.