Drug Cutoff Level Approximate Detection Time in Urine THC 50 ng/ml 0-30 Days COC 300 ng/ml 2-4 Days METH 300 ng/ml 3-5 Days OPI 300 ng/ml 2-4 Days AMP 300 ng/ml 2-4 Days BZO 200 ng/ml 3-7 Days