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According to research by Mayo Clinic Laboratories , THC is generally detectable in a drug test accordingly: Occasional marijuana use (3 times a week or less): Detectable within 3 days Moderate marijuana use (4 times a week or less): Detectable within 5 to 7 days Regular marijuana use (daily): Detectable within 10 to 15 days Heavy marijuana use (multiple times a day): Detectable for more than 30 days What Factors Affect How Long Weed Stays in Your System

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