This paper uses the widespread variation across states in the timing of adoption of tougher drunk driving laws that set very low legal blood alcohol limits for drivers under age 21-“zero tolerance” (ZT) laws-to provide new evidence on the causal effect of alcohol use on youth suicide. ZT...

On April 1, 1994, Ontario, Canada, instituted a new graduated driver license (GDL) system that effectively set the legal blood alcohol content (BAC) threshold at zero for the first few years of a youth's driving eligibility. I use data from the 1983-2001 Ontario Student Drug Use Surveys (OSDUS)...