Many addicted individuals misuse their outpatient methadone maintenance program, and take less than a blocking dose of 80 mg. so that they will be able to "feel it" if they combine their methadone dose with other drugs such as heroin.
Magic mushrooms contain around 0.2 to 0.4 percent of the hallucinogen psilocybin, along with a trace amount of psilocin; another hallucinogenic substance.
Valium specifically was detected in 26% of DUI cases in Sweden and its active metabolite nordazepam was detected in 28% of cases.
Withdrawal from benzodiazepine drugs can mimic an anxiety attack.