Do all drugs last in your hair for 90 days... i take klonopin for anxiety and worried if my job does a hair test.

Hair drug test: The ONLY type of drug test permitted under federally regulated programs is a urine drug test and its tested for 5 major drug classes - opiates, PCP, THC, cocaine and amphetamines. see https://www.samhsa.gov/workplace/resources/drug-testing IF you take prescribed medications - get a letter from doctor and take your prescription with you. Drugs in hair can be detected for a long time.