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Table 10: Detection Periods for Urine Drug Screening (Maximum Range) Cocaine 12 - 72 hours. Amphetamine 2 - 4 days. Heroin 2 - 4 days. Codeine 2 - 4 days. Cannabis (Casual Use) 2 - 7 days. Cannabis (Chronic Use) 30 days. Diazepam 30 days. There are two main methods for testing a sample. ................
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