The document summarizes findings from a 2003 survey of 238 psychologists on their treatment of substance use issues. Some key findings include: - 25% of clients seen had a current or past substance use problem, with 12% having a current problem. The most common substances were alcohol, marijuana, and cocaine. - Common interventions for clients with substance use issues included harm reduction, relapse prevention, motivational interviewing, and CBT. - Over half of psychologists discussed substance use in a client's social network, and 48% of those clients had at least one person in their network with a substance use problem.