The National Survey on Drug Use and Health (NSDUH) asks youths aged 12 to 17 to report on their involvement in violent behaviors during the 12 months before the survey. This report presents the estimated number and percentage of youths aged 12 to 17 who engaged in violent behavior in the past year. It further compares rates of violent behavior for those who used and those who did not use illicit drugs in the past year. All findings presented in this report are annual averages based on combined 2002, 2003, and 2004 NSDUH data. Youths aged 12 to 17 who used an illicit drug in the past year were almost twice as likely to have engaged in a violent behavior as those who did not use an illicit drug (49.8 vs. 26.6 percent). Rates of past year violent behavior were higher among youths aged 13, 14, and 15 than those younger or older. The likelihood of having engaged in violent behavior increased with the number of drugs used in the past year (i.e., 45.6 percent of youths who used 1 illicit drug engaged in violent behavior compared to 61.9 percent of youths who used 3 or more illicit drugs). (Contains 2 tables, 2 figures, and 6 endnotes.)