how far back will a home marijuana test detect usage?
443190
IT WILL DETECT IT IF YOU HAVE USED IN LESS THAN 3 MONTHS
851072
it depends on how much you smoked it as it can take a few days to a few weeks to be clear
886591
THC in weed lasts for 30 days. BUT you can still test positive for it up to 3 months later.
15595
Marijuana stays in ones system for around 3 months, although it can be traced in the hair follicles for a lot longer.\nHowever, if it's found in your trace, you remember a party you were @ a month or so ago, where a group of strangers were smoking this strange smelling cigarette!\nIt can be traced, but if you directly ingested it, is always in question :o)
121803
Depending on how much body fat you have, (b/c THC collects in the fat cells) about 1-2 months.
483519
Depends on if you use it regularly or not. If you are smoking daily, it can stay up to a month in your system, and would be detected by a urine test for that length of time.
138495
It depends on alot of factors...\n\nhttp://www.concept420.com/how-long-does-marijuana-stay-system.htm
968764
Seven to thirty days.\n\nTesting for weed\nhttp://www.marijuana.org/BeatDrugTesting.htm
343901
Saliva tests can detect THC in your system if you've smoked anywhere from 72-48 hours before the test.  If it's been longer than that you are in the clear.
430103
Is this for a drug test? Seems like around 4 days, if you can understand the doctor-speak of these articles. \nIf you have presciption there shouldn't be a problem.
734777
I've never heard of Surgel...it must be some gimmick that says it will clean your system from drugs.  It's a lie.  There is NOTHING that will get drugs out of your system.  And weed stays in longer than any other drug.  10-14 days for a urine test and 3-6 months for a hair follicle test.
1091120
I think it is commonly reported to remain detectable for 30 days;  from:  http://www.craigmedical.com/drug_test_faq.htm\nTHC (marijuana): Tetrahydrocannibinol (THC) is an active component in marijuana. Marijuana, a hallucinogen, is commonly ingested by smoking, but it may also be eaten. Marijuana may impair learning and coordination abilities. Marijuana is most commonly the drug of choice among teenagers and young adults. The hallucinogenic effect of Marijuana can lead to irrational behavior, disorientation, and paranoia. Low concentrations of THC persists in urine at a detectable concentration for many days after smoking. Marijuana is the most common recreational drug of abuse.\n\nflush?:  http://www.passyourdrugtest.com/
605369
I'm not a scientist, but from the research I've done online I found that since substances stay in your hair shaft for long periods of time, depending on the length of your hair.\nI've also read that they can find substances you might have been exposed to up to 10 years ago!\n\nI've noticed some companies list they do drug testing on hair, which is just rude, since what you did years ago has no bearing on what you do now.
430766
The detection period for occasional users is up to 10 days. For long time users its 30 days or more.
361042
If the drug screening uses a hair folicle test then yes. Second hand marijuana smoke can show up in a hair folicle approximately one month after exposure. However, since that particular screening is very expensive most employers use a urinalysis or blood test, in which case most people will pass the test.
1154389
I really don't thinks cause it can test for every thing you have done in the past a six months and that is a long time to go to get clean so the best thing is to either get clean and stay that way or just forget about passing any of those drug tests cause they are to wise to all the new thing people do and use to even pass urine tests they can even tell if you have overloaded yourself with fluids to dilute a substance and will fail you on it.
1178528
Only the marijuana plant contains the THC.  Some people extract the THC to put in brownies and stuff.   But there will be no way that the test will come out positive if he has been clean for.....depends on how long he's been using.  It takes 8 days per joint to clear any traces of THC from the urine.   If he smoked a lot, then it would probably take about 3 weeks to a month to clear.  The lab is pretty accurate, they can also detect if the person taking the pee test has diluted it in anyway.  So they're hardly faulty I'd say.  I'm very very sorry to break it to you.  1 year will go by before you know it.  It's not like he's been using heroine or crack, right?