Based on the work of Miller & Sovereign (1989) who studied an intervention called The Drinker's Check-Up, additional study is warranted with brief stand-alone motivational enhancement interventions targeting individuals with substance abuse disorders who are neither self-initiating change nor seeking treatment. The Teen Marijuana Check-Up is an in-school intervention designed to elicit the voluntary participation of adolescents who smoke marijuana. This presentation will discuss the manner in which participants are recruited, challenges to maintaining confidentiality, the rationale for waiving parental consent, contents of the assessment interview and feedback sessions, important elements of staff training and supervision, and issues that arise in collaborating with public school staff. The designs and findings of two pilot studies with this intervention will be presented, followed by a presentation of a currently underway randomized controlled trial being conducted in six Seattle high schools.