Analytical True Positives in Workplace Drugs Testings Due to Use of Prescription and OTC Medications

Abstract

Analytical true positive workplace drug testing results due to use of prescription medication or OTC (over-the-counter) medication do occur. Amphetamine positive result due to prescription medication was discussed in Chap. 9. Prescription use of any benzodiazepine may cause positive test results although benzodiazepine is not one of the SAMHSA drugs. Topical use of cocaine may cause positive results in workplace drug testing. Many pain medications contain opiates and use of such medication leads to false positive opiate tests. Marinol is synthetic marijuana which is metabolized in the same way as marijuana and can cause positive marijuana results in workplace drug testing.