 - A current diagnosis within the past month of other substance abusedependence diagnoses such as cocaine, amphetamine, or opiates. Length of abstinence will be verified through participant interview and a chart review at the initial study visit, which typically includes information about substance abuse treatment history and objective verification with breathalyzer andor urine toxicology screens. Occasional drugalcohol use not meeting criteria for abusedependence will not be exclusionary. 