Contingency Management for the Treatment of Co-Occurring Alcohol and Drug Misuse

"Escalating reinforcement for alcohol abstinence.~Alcohol-negative CM Participants draw chips out of a bowl containing 500 chips. Fifty percent of the chips will say good job! or a similar encouraging phrase, 41.8% of the chips will result in a small prize, 8% will result in a large prize, and 0.2% will result in a jumbo prize."

"Escalating reinforcement for drug abstinence.~Drug-negative participants will be invited to draw chips out of a bowl containing 500 chips. Fifty percent of the chips will say good job! or a similar encouraging phrase, 41.8% of the chips will result in a small prize, 8% will result in a large prize, and 0.2% will result in a jumbo prize."

"Escalating reinforcement for drug and alcohol abstinence.~Drug- and alcohol-negative participants will be invited to draw chips out of a bowl containing 500 chips. Fifty percent of the chips will say good job! or a similar encouraging phrase, 41.8% of the chips will result in a small prize, 8% will result in a large prize, and 0.2% will result in a jumbo prize."

Compensation for Non-Contingent control group participants is dependent only on providing urine samples, regardless of whether the urine tests are negative for alcohol and/or drugs.