Eli5 How far back do drug tests check?

Question

I don’t know how to phrase the title, I’m sorry.
ANYWAYS, do drug tests check if you’ve EVER done drugs, or or in a specific amount of time? Or does it depend on anything else?

In: 8

Answer 1

Urine/blood
Pot – Up to a month and a half, but an average of a couple weeks.
Coke/meth/X – one week
Hair
Depends on the length, but typically 3-6 months