The report is divided into felonies (crimes punishable by death or by imprisonment in a State prison) and misdemeanors (crimes punishable by imprisonment in a county jail for up to 1 year). Felony offenses were further divided into narcotics, dangerous drugs, marijuana, and all other offenses. Misdemeanor offenses were divided into marijuana, and other drugs. Data were reported by city police departments, county sheriff's offices, the California Highway Patrol, and other law enforcement agencies who report monthly to the California Department of Justice. The report compared arrest information for the juvenile at-risk population (ages 10-17) and the adult at-risk population (ages 18-69). During the period 1990 to 1999 the overall juvenile arrest rate for drug offenses increased 39.0 percent, while the adult arrest rate decreased 11.4 percent. By comparing felonies and misdemeanors between juveniles and adults, genders, ethnic groups, age groups, and types of offenses in detail, the report developed a picture of the dynamics of California drug arrest trends in the 1990's. Notes, tables, figures, appendixes