I quit smoking pot 3 weeks ago. how can i make sure i pass a drug test for a new job?

Depends: It depends on how long have you been using weed and how heavily. Chronic heavy users may test positive for months after quitting. People with more fat test positive for longer. For more information you may consult this site. http://www.mayomedicallaboratories.com/test-info/drug-book/viewall.html

Good luck: Chances are that you will be fine. If you have a very low level, as may happen if you were once a heavy user, claim it is from passive inhalation and get a lawyer. This isn't the place to discuss the wisdom of the cannabis laws or testing for it in the workplace. I'm glad you're seeking work and wish you the best.

You can't: there are a zillion products that tell you that they can help, but they can't. Using large amounts of water or other liquids to increase excretion really doesn't work, and if you take so much that it dilutes your urine excessively, that itself will flunk you on most tests. You can test yourself with a drug store urine test to see if you are still positive. In mild-moderate users, it should be neg