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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Urine analysis can detect drugs for a longer period of time compared to oral fluid testing, especially if the drug has a long elimination half-life and there is a longer interval between use and testing. This means that a positive result may be detected in urine analysis even if it would not show up in oral fluid testing.

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