Teens will be included if they meet any of the following criteria: 1) in the year prior to incarceration they used marijuana regularly (at least monthly); 2) in the year prior to incarceration they drank regularly (at least monthly) or binged (>=5 for boys; >=4 for girls) over any two week period or less; 3) they used marijuana or drank in the 4 weeks before the offense for which they were incarcerated; or 4) they used marijuana or drank in the 4 weeks before they were incarcerated.