[hoosierskypilot]

"...he could have avoided using marijuana in the weeks prior to his drug test..."

Question: how long does it take the human body to purge all traces of pot?

If you can answer that, tell me, how long does it take the human body to purge all traces of nicotene?

[HairOfTheDog]

It takes about three-five weeks to have levels fall below a testable window for a normal person.