Study compared marijuana urinalysis results to self-reported marijuana use from 33,313 juvenile arrestees surveyed through the Arrestee Drug Abuse Monitoring Program (ADAM) between 1991 and 1997. While strength of agreement between the two measures varied by jurisdiction, intrajurisdictional agreements were consistent over time. Findings suggest that the need for urinalysis should be reevaluated. (Contains 16 references and 2 tables.) (ADT)