If the interval between use and testing is long and the elimination half-life is long,urinanalysis can sometimes produce a positive result where oral fluid testing would not.

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Quizplus · Accepted Answer

Urine analysis can sometimes detect traces of drugs for a longer period of time than oral fluid testing because drugs may stay in the body's system for a longer time and the elimination half-life is long. This means that someone may have stopped using drugs but still test positive on a urine test. Oral fluid testing is believed to be more accurate because it can detect more recent drug use.

If the Interval Between Use and Testing Is Long and the Elimination