1 what is hair drug testing hair testing analyzes a hair sample for parent drugs and their metabolites a hair specimen collected from a donors head or body is sent to the laboratory and is screened for illicit substances. Hair follicle drug test on the 26th i dont do drugs but i was in the house when my brother in law was smoking weeda nurse said that it could get on my hair and thats how they test the hairso now i am kind of freaking out about itjust wondering. What is hair drug testing hair testing analyzes for drugs within the hair shaft rather than body fluids like urine or saliva to determine whether drugs of abuse are present. A hair follicle drug test measures the drug molecules and their specific metabolites that are produced only after the drug has been processed by the human body after the drug is processed trace amounts of its metabolites are inserted into hair follicle by the bloodstream. Drug testing is the evaluation of a urine blood or other type of biological sample to determine if the subject has been using the drug or drugs in question there are many circumstances that may lead to drug testing drug testing is often done when applying for employment especially for positions
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