How long drugs stay in your system depends on the type of drug and the method used to test. Marijuana is a fat soluble drug, so it can stay in your system a very long time. Also, a hair test can detect almost any drug for up to three months.
You can find more information here: en.wikipedia.org/wiki/Drug_test#Detectio....
The after life of a drug in your system will depend on the drug you take and the condition of your body. Steroids can last up to nine months.
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