Prisons are rife with people convicted of drug crimes. These individuals may have been incarcerated for a range of drug-related offenses, from driving under the influence of alcohol to possession of drug paraphernalia.

Some inmates imprisoned for drug crimes do not have a drug problem. But addiction is still common among prisoners. According to The Center for Prisoner Health and Human Rights, about half of people in prison or jail meet the criteria for substance abuse or dependence.

Many people with addiction also have a mental health disorder, such as depression or post-traumatic stress disorder. About 45 percent of inmates in local jails and state prisons simultaneously grapple with a substance use and psychological disorder, according to the National Institutes of Health.