Weed, also known as marijuana or cannabis, is usually detectable in bodily fluids for 1 to 30 days after last use. As with other drugs, it may be detectable in hair for several months. Weed detection windows depend on how much you smoke or ingest, as well as how often. In general, higher doses and more frequent use are associated with longer detection times. For daily users, cannabis may be detectable for several months after last use.
How Long Does Marijuana Stay in Your System?
How long does marijuana stay in your system? Blood, urine, and hair
The length of time this chemical stays in the body or continues to show in a drug test depends on many factors. These include:. Drugs such as alcohol may completely disappear from the body in just a few hours. In comparison, weed lingers much longer. Drug tests can detect tetrahydrocannabinol, or THC, in urine, blood, and hair for many days after use, while saliva tests can only detect THC for a few hours. This is because of the way the body metabolizes THC. THC is a lipid-soluble chemical.
Marijuana Detection Time – How Long Does Marijuana Stay In Your System?
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Reports of prolonged drug excretion have provided the basis for the common assumption that cannabinoid metabolites may he detected in urine for a week or longer. The accuracy, sensitivity, and specificity of immunoassays for the detection of cannabinoids and metabolites are unique for a specific assay and may change overtime. Six subjects each smoked a single marijuana cigarette placebo, 1. Each urine specimen was analyzed under blind conditions by immunoassay according to the manufacturer's instructions. The following cannabinoid reagents were evaluated: EMIT d.