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The urine drug test is primarily used for pre-employment medicals due to its wider detection window, while the oral fluid test is more relevant for current employees as it identifies recent drug use. It's essential to note that the initial urine test serves only as a screening tool, indicating drug classes rather than specific drugs. Results are categorized as negative or non-negative; thus, non-negative samples require further testing via laboratories using LCMS and GCMS methods to accurately identify specific drugs. Cut-off levels for each drug class must be exceeded for results to be deemed non-negative or positive in GCMS testing.