Follow Sophie Saint Thomas on Twitter. Depending on many factors, including body mass, frequency of use, and metabolism, traces of marijuana can show up in your urine from 2 days to 3 months with the average time to being naturally clean for most users being roughly 30 days after cessation. Ignore the rumor going around that drinking bleach will purify your urine. The lab tech could flag your sample as diluted based on visual appearance alone. More and more employers include a hair follicle test in the pre-employment screening these days to be doubly sure about the drug usage habits of potential employees.
Consider challenging the test if you don't pass.
How to Dilute Your Urine to Pass a Drug Test