A lawsuit was filed in 2011 by Nevada resident S. Rowan Wilson after she tried to purchase a gun for self-defense and was denied based on a federal ban on the sale of guns to users of illegal drugs. Though marijuana has been legalized in some places on a state-by-state basis, it remains illegal under federal law. The court maintained that drug use “raises the risk of irrational or unpredictable behavior with which gun use should not be associated.”