General Question

Amazebyu's avatar

How long does THC stay in your system?

Asked by Amazebyu (488points) May 1st, 2011 from iPhone

My son has probation and will be drug tested next week. He mentioned to me that he smoked 7 days ago. He’s working out and trying to sweat it out. But don’t know if that will work. So how long does it take for THC to disappear from you system?

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15 Answers

SofaKingWright's avatar

I believe it can be picked up in urine for a few weeks. It can stay in the hair for months.

Lightlyseared's avatar

It depends who and how the testing will be done. A top class lab will be able to detect THC in urine or blood 30 days after taking it. More realistically someone who only smokes occasionally is unlikely to test positive 3 or 4 days after smoking while a regular heavy smoker will probably stop testing postivie after 10 to 12 days.

YoBob's avatar

It is detectable in you blood for several weeks. It stays in your hair follicles for months (as long as it takes that strand of hair to grow long enough to be cut off below the contaminated part, and yes, this includes all body hair).

MyNewtBoobs's avatar

Depends on if he’s been smoking heavily. If this is the first time he’s done it in months, he’ll be fine. 3–4 times in the past month, still probably ok. More than that? Maybe not so much. You should pick up an at-home drug test from the grocery store or Walgreens or somewhere.

KateTheGreat's avatar

Do you know if it’s a mouth swab or a piss test?

marinelife's avatar

A long time:

“Most researchers agree that urine tests for marijuana can detect the presence of the drug in the body for up to 13 days.

However, there is anecdotal evidence that the length of time that marijuana remains in the body is affected by how often the person smokes, how much he smokes and how long he has been smoking. Regular smokers have reported positive drug test results after 45 days since last use and heavy smokers have reported positive tests 90 days after quitting.”


Amazebyu's avatar

@mynewboobs he said he smoked like 2 grams in two setting in one month (not sure that a lot?)
@katethegrate it will be a urine test.

KateTheGreat's avatar

@Amazebyu How big is he? If he’s a bigger guy, they can detect it up to 6 weeks.

MyNewtBoobs's avatar

@Amazebyu If you type in the first couple letters of a users name, it’ll pop up with options and you can just click on the user. Much easier, I think! He should be fine. I’d go get a drug test (they’re 15–30 bucks, iirc) and it’ll be the same thing.

El_Cadejo's avatar

This is only a guide but it helps. its a small program that ya got to install but dont worry, its clean of viruses and such. I checked for ya before posting and have used it before.

My suggestion would be to drink a gallon or more of green tea a day up until the test. Any fluids will help clear it out but the antioxidants in green tea accelerate this process.

And as mentioned above, metabolism and body weight play heavily into this.

mrrich724's avatar

It depends on how frequently he is using. I did it once and took a pee test for work 3 days later. I didn’t even “try to sweat it out” or drink lots of water.

If you use alot, then it might be different.

If he’s really worried, fruit pectin works. I knew a kid who lit up daily (multiple times daily). He applied at an engineering company. Three days before his test, he mixed the powdered pectin with water. He said something about the pectin gelatinizing in the system and absorbing the evidence.

He passed his test . . .

silky1's avatar

If he is not a frequent smoker he may be ok. With marijuana it’s hard to judge. If your really worried get one of those quick detox kits.
Cannabis and Drug Tests
by Erowid

Tested for in Standard Drug Tests? YES
Detection Period in Urine Single Use : 48–72 hrs
Habitual Use : up to 12 weeks

Lightlyseared's avatar

I would avoid taking anything as a detox. Most modern drug tests also screen for common detox agents as well as the actual drug. Even if you don’t test positive for the drug the presence of the detoxers would count as a fail.

dabbler's avatar

A regular (daily) smoker I know got some urine test strips (you can find them online) and it took 4 days to drop below positive and another 3 to drop off the detectable scale completely.
Some will swear by herbal flush preparations you can get at your health food store, but I think you’ll get similar affect per @uberbatman drink a lot of green tea or other diuretic.
Exercise is good too but as mentioned it depends on body composition (more fat will retain more drug traces) and size how effective any method of purging will be.

Tarakakid's avatar

My son just did the same and I thank you all so much for the help. I was in tears when I found out last night and at least now I know what we’re up against. I hope they both straighten up. Thank you all!

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