Pulaski County Daily News added a post from January 9 at 3:00pm to their timeline. Â· January 9 at 3:00pm Â· Oak Grove, MO Â· Live blog of the St. Robert City Council.
1 For moderate smokers it is 1-2 weeks. Frequent users can test positive more than 2 weeks, and in rare cases marijuana can stay in the system of heavy smokers more than a month.  Hair. This kind of test is less common and key factors do not have any impact on its marijuana detection time.
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