BEWARE THAT LOW URINE CREATININE!

BEWARE THAT LOW URINE CREATININE! Vera F. Dolan, MSPH, FALU Robert L. Stout, PhD Michael Fulks, MD ... All cocaine positive samples were con fi rmed with Hewlett Pack- ... Both true-positive and false-positive rates (without mass spectrographic con fi rmation) are likely higher using the lower cotinine threshold, but ................
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