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See below for DAU cutoff levels. A specific drug is not detected by the particular antibody (e.g., fentanyl) Urine has been adulterated by dilution or bleaching. Very dilute urine. Urine Drug of Abuse (DAU) Positive Cutoff Levels. Amphetamines 1000 ng/ml d-amphetamine. Methamphetamines 1000 ng/ml d-methamphetamine. Opiates 300 ng/ml morphine ................
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