How Long Do Illegal Drugs Stay In Your System?

Drugs remain detectable in your system long after their effects have worn off. william casey/Shutterstock

Some drugs are excreted faster than others

Because drugs need to be converted into soluble metabolites before they can be excreted, the speed with which this can occur depends largely on what sort of metabolites are created and how concentrated these are. LSD, for instance, is typically taken in very small doses, rarely exceeding 100 to 200 micrograms, which means only tiny amounts of metabolites are likely to be detectable in a user’s system.

Furthermore, most metabolites of LSD tend to pass out of the body very quickly. The main one, for example, is 2-oxo-3-hydroxy LSD, which is completely undetectable in the bloodstream and only present in very small quantities in urine, but only for a few days.

So how long does each drug actually stay in your system for?

The most common types of drug tests will look for drug metabolites in the blood, urine, and hair, the latter of which can become contaminated with traces of drugs as blood washes over the follicle. So without further ado, here’s how long some common illegal drugs remain detectable for:content-1467821493-drug-test-urine-blood

Cannabis: 7 to 30 days in urine; 90 days in hair; 14 days in blood

Cocaine: 3 to 4 days in urine; 90 days in hair; a day or two in blood

Heroin: 3 to 4 days in urine; 90 days in hair; about half a day in blood

LSD: Up to 3 days in urine; 3 days in hair; less than five hours in blood

MDMA: 3 to 4 days in urine; 90 days in hair; a day or two in blood

Methamphetamine: 3 to 6 days in urine; 90 days in hair; up to three days in blood

Image: Urine and blood are the most commonly tested body fluids for drugs. JPC-PROD/Shutterstock

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