Effect of prize-based incentives on outcomes in stimulant abusers in outpatient psychosocial treatment programs: a national drug abuse treatment clinical trials network study.

Context: Contingency management interventions that provide tangible incentives based on objective indicators of drug abstinence are efficacious in improving outcomes in substance abusers, but these treatments have rarely been implemented in community-based settings.

Objective: To evaluate the efficacy of an abstinence-based contingency management intervention as an addition to usual care in community treatment settings.

Design: Random assignment to usual care or usual care plus abstinence-based incentives for 12 weeks.