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Immunoassay methodology isn't very reliable when it comes to UDS. They have can easily have false positives because they are picking up the structure of the molecule and if someone has taken something similar in structure then it may flag as positive. Im not sure why they don't pick up clonazepam, but I had read that they have false negatives ~30% of the time with benzos.
See if they can just call into Quest and have then do the mass spectrometry for Benzos and that should pick it up.
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