Weed isn't considered a drug in some places, yet in some remains illegal. Do you consider weed as a drug or ? It's the most known way to fail a drug test.
It is considered a drug, its not considered 'illegal' in some places. ive used for 5 years and ill admit its a drug, but then again so is caffiene!
On topic though, to pass a drug test:
bring blunt into testing room
proceed to light up and get high as fuck
take drug test while blazing
walk out and lol
win