Asked in Illegal Drugs
Can a person pass a hair follicle test if they have used once in the past 3 months?
It all depends on the type of drug and amount used. Pretty much the deal with the hair tests are that they are extremely accurate, and it you used once it may show up. However, the cut-off levels are such that even if it shows up in the results, if you truly only used once it will be below the cut-off and the results will be listed as negative.