The Drug Abuse Warning Network (DAWN) is a public health surveillance system that monitors drug-related hospital emergency departments and drug-related deaths investigated by medical examiners and coroners. According to DAWN, there is a critical juncture in drug taking behaviors that occurs during the adolescent and young adult years. Interventions for 18 to 20 and 21 to 24 age groups should focus on heroin, cocaine, and illicit stimulants because the involvement of these drugs in ED visits increased with age.