marijuana can for like up to 30 days, quantity matters. Coke, only a week I hear, V's and others not sure.
Depends on the test, if it is hair you are F'd for years. Urine is the standard, but some urine test are a joke. I was on probation years ago and they had this "at-home" drug test they used. I would drink two gallons of water fast before going in. I would start pissing often and alot before I made it in till it was running clear all the time. I did learn though not to make it cold water, I started freezing from the inside out.
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