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At most, THC can remain in the bloodstream for up to four hours but can stick to saliva molecules for more than a day at most. Companies commonly test employee urine to retain cannabinoids for up to a month. The most extended period a cannabinoid can remain detectable in a human is three months (90 days), and it is usually within the hair follicles.

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Source : How Long Do Marijuana Edibles Stay in Your System? (Asking for a Friend)

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