Name a common method used to assess substance use in clients.

The Alcohol Use Disorders Identification Test (AUDIT) is widely recognized as a common method for assessing substance use, specifically focusing on alcohol use disorders. It is a validated screening tool that helps identify individuals who may have alcohol-related problems, allowing counselors and clinicians to gauge the severity and impact of alcohol consumption on a person's life.

The AUDIT consists of a series of questions that inquire about alcohol consumption patterns, dependence symptoms, and alcohol-related consequences. This structured approach provides a comprehensive understanding of a client’s drinking behaviors and supports the development of appropriate interventions or treatment plans tailored to their needs.

In contrast, while the other instruments listed have their specific uses, they do not focus exclusively on alcohol or might encompass a broader spectrum of assessments. The Addiction Severity Index (ASI) is more comprehensive, assessing multiple areas of a person's life affected by addiction, while the Substance Abuse Focus Questionnaire and the Mental Health Assessment Tool have different focal points, which may not be solely dedicated to substance use evaluation. This makes AUDIT more commonly recognized for assessing alcohol use specifically, fitting the context of the question.