Healthy volunteers
Accepted
Inclusion Criteria:
* Inclusion criteria are: at least 18 years of age, enrolled in the San Francisco Veteran Affairs Medical Center (SF VAMC) Substance Abuse Programs, residing in the San Francisco Bay Area and not planning to relocate out of the area in the next 18 months. For patients in the Day Hospital, we will wait until they have completed one week of treatment before approaching for study involvement, as the first week is the most intensive for services.
Exclusion Criteria:
* Exclusion criteria are: unstable psychiatric disorder and severe cognitive impairment.
