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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

Study: Magic mushrooms are the safest drug

Disclaimer: Popular Science does not endorse the use of illegal drugs.

If you’re looking to play it safe when it comes to illicit substances, look no further than the humble shroom. It’s non-addictive, hard to overdose on, and you can grow it yourself. And, according to a massive report by the Global Drug Survey, it sends the fewest people to the emergency room of any drug on the market. Take that, meth.

Perhaps the most dangerous thing about psychedelic mushrooms is that they’re easily confused for the poisonous kind. There are over 100 varieties of psilocybin-producing shroomies, which is the chemical that makes you trip when you eat them. Some of them are bound to look like toxic varietals, especially if you’re in a hurry to get high. Just as you should never grocery shop while hungry, you should never go mushroom hunting while jonesing for a trip.

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