The document discusses different types of data that states collect related to safe and drug-free schools, including truancy rates, incidents of violence and drug-related offenses, types of prevention programs and services provided, and student perceptions and behaviors related to drug use and violence. It notes challenges in collecting uniform and comparable data across schools and districts due to varying definitions and methods of data collection. Tennessee specifically collects data on suspensions, expulsions, victims of violence, and surveys of youth risk behaviors.