Marijuana Legalization Linked to Diverging Crime Trends

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A new study has found that legalizing marijuana for adult use is linked to gradual reductions in violent crime, while medical cannabis legalization is associated with lower rates of property crime. The research, published in the journal Economic Modelling, examined the relationship between different forms of cannabis legalization and crime trends across the United States.

Why it matters

As more states move to enact marijuana legalization, understanding the impact on crime rates is crucial for policymakers and the public. This study provides valuable insights into how the type of legalization - recreational vs. medical - can lead to diverging effects on violent and property crimes.

The details

The study, conducted by researchers at Jack Welch College of Business and Technology, Barnard College, National Chengchi University and Longwood University, found that while initial analyses suggested adult-use legalization might increase property crime, more robust models showed the effect becomes negative and statistically insignificant. Conversely, the researchers determined that medical marijuana legalization reduces property crime, while recreational legalization reduces violent crime. The authors noted that the impacts of cannabis reform on crime are gradual, taking several years to manifest.

• The study was published in March 2026.

What’s next

The researchers noted that policymakers considering marijuana legalization should wait a few years before evaluating the cost-benefit impact, focus on the specific type of legalization, and closely study the outcomes from similar states.