This document discusses the important role that parents play in preventing teen drug and alcohol use. It emphasizes that parents who communicate clearly about the risks of substance use and monitor their teen's activities and friends can significantly reduce the likelihood that their teen will use drugs or alcohol. The document provides tips for how parents can communicate effectively with their teen, monitor their activities, and address potential issues around substance use if detected. It stresses that parents have significant influence and should not be afraid to talk to their teens about important issues.