After the legalization of marijuana, fatalities on the roads of Colorado dropped, contrary to the hysterical claims of anti-drug crusaders.
some researchers have gone so far as to suggest that better access to pot is making the roads safer, at least marginally. The theory is that people are substituting pot for alcohol, and pot causes less driver impairment than booze. I’d need to see more studies before I’d be ready to endorse that theory. For example, there’s also some research contradicting the theory that drinkers are ready to substitute pot for alcohol.
Drugs might not make things better, but the War on Drugs sure as hell made them worse.