The answer could depend on whether they're testing urine or hair.
You learn quite a few tricks in the pen.
The results shocked us!
Ever been at a festival and wondered what your drugs have been cut with? We helped a bunch of Bestival-goers answer that question.
You need to be clean for 72 hours to give a drug-free urine sample. Unless you have a fake dick and pee, then you can do whatever you want.
Polls suggest most Americans believe states should drug test individuals who benefit from government programmes, and politicians are following their lead.