This question has also been asked and answered here: How long does Marijuana stay in your system?
As a rough guide: if you smoke the occasionally joint, it'll stay in your system for up to 10 days. If you smoke regularly, up to 45 days and if you smoke constantly, 90 days.
As for being detectable in a drug test, well this depends on the type of drug test. Urine test will detect up to a month prior but a blood test will show positive if you've smoked any weed in the last 6 months.
Also important to note that marijuana residue is stored in the fat cells, so if you're skinny or have a high metabolism, the time it takes to leave your system may be reduced.
Search for questions
Still looking for answers? Try searching for what you seek or ask your own question.
Posted 30 Jul 2009 • 12 answers
Drug Test - focalin will it show up on drug screen how long does it stay in system what does it show
Posted 14 Jan 2010 • 1 answer
Posted 11 Mar 2011 • 4 answers
Posted 15 Mar 2011 • 2 answers
Posted 26 Apr 2011 • 5 answers