Reviews two projects which investigate innovative & appropriate methods to identify & intervene with substance-abusing youth -- the Amer. Correctional Assoc. & the Institute for Behavior & Health, Inc. project, & the Amer. Probation & Parole Assoc. project. Both programs emphasized the development of effective strategies for screening & testing youth for illicit drug use. Includes project descriptions & discussion of the outcomes & benefits of each as well as a discussion on program development. Recommendations are made for future actions. Glossary. References. Charts & tables. Sample drug-testing forms.