Which statement best describes the relationship between severe mental illness and substance abuse among inmates?

Which statement best describes the relationship between severe mental illness and substance abuse among inmates?

• A. Approximately three-quarters of those with severe mental illness also have drug/alcohol abuse
• B. Approximately half of those with severe mental illness also have drug/alcohol abuse
• C. Approximately one-quarter of those with severe mental illness also have drug/alcohol abuse
• D. All those with severe mental illness have drug/alcohol abuse

Answer: (A)

Inmates with severe mental illness commonly have co-occurring substance use disorders; this overlap is a defining pattern in many prisons. The best choice reflects that large majority—roughly three-quarters—have drug or alcohol abuse alongside their mental illness. This dual-diagnosis reality means substance use often accompanies severe psychiatric conditions and can complicate treatment, safety, and ongoing care if not addressed together. It isn’t universal that every individual with severe mental illness has a substance issue, and rates aren’t reliably exactly half or a quarter across all settings, though they do vary. So describing the overlap as around 75% best captures the typical relationship observed in inmate populations.

Inmates with severe mental illness commonly have co-occurring substance use disorders; this overlap is a defining pattern in many prisons. The best choice reflects that large majority—roughly three-quarters—have drug or alcohol abuse alongside their mental illness. This dual-diagnosis reality means substance use often accompanies severe psychiatric conditions and can complicate treatment, safety, and ongoing care if not addressed together. It isn’t universal that every individual with severe mental illness has a substance issue, and rates aren’t reliably exactly half or a quarter across all settings, though they do vary. So describing the overlap as around 75% best captures the typical relationship observed in inmate populations.