Eleven states and the District of Columbia have legalized marijuana. A new study funded by the National Institute of Justice sought to determine the effect of this legal change on crimes rates in Colorado and Washington. The study found no statistically significant long-term effects of recreational cannabis laws or the initiation of retail sales on violent or property crime rates in either Colorado or Washington, with the exception of a decline in burglary rates in Washington. This suggests that the legalization and sales of marijuana have had minimal to no effect on major crimes in these states. The study's authors note that because they examined changes in serious crime, they cannot address the effect of legalizing marijuana on other types of crime (e.g., crimes related to driving under the influence of cannabis). In addition, they say they cannot rule out the possibility that marijuana laws might have different effects on different types of communities within a state.