-=DrUg TeSt=-

DrUg TeSt
-is a technical analysis of a biological specimen - urine, hair, blood, sweat, or oral fluid / saliva - to determine the presence or absence of specified parent drugs or their metabolites.
sWeAt DrUg TeSt

-tests are patches attached to the skin to collect sweat over a long period of time (10–14 days). These are almost exclusively used by child protective services, parole departments, and other government institutions concerned with drug use over long periods, when urine testing is not practical. The patches have security features that keep them from being covertly removed and then reapplied without the knowledge of the testing agency. At the end of the test period, the patch is removed by a social worker or parole officer and sent to a lab for analysis. If the person has used any drugs during the period that the patch was in place, they will test positive for that drug. This type of testing has fallen out of favor with government agencies due to documented problems with certain drugs.

hAiR dRuG TeSt

-can provide a much longer window of detection, which is useful for highly safety-critical positions where there is zero tolerance of drug usage. Even if the person being tested has a shaved head (perhaps in preparation for the test), hair can also be taken from almost any other area of the body. This includes facial hair, the underarms, arms, and legs.

It costs less than urine testing, and one must have a lab for results. Hair testing is becoming more reliable as technology advances, and there is no known way to adulterate a hair specimen in order to falsify the results of the test, despite what some retailers advertise.