Jan 052013
 January 5, 2013

marijuana weed drug testing system saliva hair urineThe data used to create this infographic is gathered from research on drug testing methods and the information presented by drug screen manufacturers. Some resources include Redwood ToxicologyCannabis Drug Testing,California NORML. The information presented is only a guide or estimate since drug testing has many variables that can influence a positive or negative outcome.

How Long Does Marijuana Stay in your System? is the most frequently asked question that we receive at HomeHealthTesting.com. While there is no definitive answer, we have presented some guidelines. The only way to really know if you are positive is to test yourself. You can test yourself with a cheap drug test and know if you are positive. Buy a THC urine drug test

How long does THC stay in your system?

The most common drug tests used are urine, saliva and hair. Each test has a different detection time which is important to know. The urine drug test is the most commonly used because it is cheap and has a longer detection time than a saliva test. There are several very important factors that can influence how long THC will be present in your urine:

  • Weight
  • Body Fat
  • Amount Used
  • Frequency of Use

Since these factors will vary greatly for each individual, there are no definitive guidelines to tell you how long you can test positive for THC.

On a Urine Drug Test, THC will appear as a positive within 2-5 hours of use. How long it will still show on a urine drug test is estimated based on frequency of use, but does not take into account the weight and body fat of the marijuana user:

  • One Time User may show positive for 1-6 days
  • Moderate User may show positive for 7-13 days
  • Frequent User may show positive for 15 or more days
  • Heavy User may show positive for 30 or more days
  • Some Heavy Pot Smokers have reported being positive 45-90 days after quitting

On a Saliva Drug Test, THC will test positive within one hour of use, but may only show positive for about 12 hours after last use.

On a Hair Drug Test, THC will show up about 7 days after use and most hair drug tests will test for a 90 day period. However, THC does not always bind to the hair follicle which makes it not always considered an accurate testing method for marijuana use.

The most reliable way to know if you are testing positive for marijuana use is to drug test yourself.

how long does weed stay in your system
By: HomeHealthTesting.com

About Johnny Green

Johnny Green is a marijuana activist from Oregon. He has a Bachelor's Degree in Public Policy. Follow Johnny Green on Facebook and Twitter. Also, feel free to email any concerns.
  • Scott Eaton

    Are you that STUPID to smoke weed BEFORE your test ? Of course you going to fail you bunch of idiots

    • frank

      Course*….. Idiot

      • Guest

        I’m shocked that you were able to stop blowing your boyfriend in order to write back ! You dope

      • Scott Eaton

        So I see you HAVE been an asshole your whole life…..Whats it feel like ?

    • Anon

      As a regular smoker myself, totally agree. I know sometimes things happen, you get injured on the job and you aren’t expecting it, you get picked as one of the “lucky” people at your job for random testing, and you don’t have time to stop smoking for a few days/weeks to get it out of your system. But if you KNOW you’ve got a test coming up, why on earth would you risk it? It makes no sense at all.

      • Scott Eaton

        Thank you……this is because most of these KIDS think that they can do what ever they want….these are the Stupid kids that make hash oil and blow the house up….These are the same KIDS that make weed into crack ( dabs ) And these are the same brainless Children who will RUIN legal weed for every one…..Make the Legal limit to smoke weed 25 and if they get caught being under 25….3 years in prison……And this is from a person that when I smoked weed looked like a burning building……..I can’t smoke it now even though I want to but The Government has its hand up my ass because I have a CDL License…….Weed will never be legal until the DEA is shut down or focus on real crime……Thank the asshole Richard Nixon for that…..glad he’s dead…….Now were stuck with some weak pussy black President that will not fix this problem……..Just remember If you pull the handle for Chris Christie as your next President we will go back to the Nixon years……F Christie in his mouth

  • Trevor

    I’m 116 pounds and like 5’2. Like 16.9% of my body is fat. How long will it take to leave my system? I’ve been drinking water and haven’t smoked since last Sunday? Any answers

  • indigo

    Last time i smoked was before november and haven’t smoked since. im not a heavy smoker at all only smoked a 5 out of a piece. im 5’4 about 140 or more i drink water everyday and exercise everyday. with your help and honesty do u think i will pass this month?

  • hoots101

    I’m 5’6, 150 pounds I smoke weed on a regular basis actually a lot and I have a test in 2 weeks If I completely cleanse will I pass?

  • anonymous22

    I haven’t smoked in a year an four months. An i hit the blunt twice like 2 days ago. I don’t test till February the 17. Do you think it will be outta my system by then. Im 5’3 weighing 110lbs.???

    • Jim

      Yes just drink alot of water and exercise

      • Scott Eaton

        Water doe’s not reduce the THC in your system… That’s a Myth

  • DG303

    What’s considered frequent opposed to heavy?

  • unknown93

    I weigh 115lbs I smoked two charges off a joint today I drank a gallon of water today I got a pee test tomorrow at my probation office can I pass the test

    • Scott Eaton

      Nope your going to jail for violation of probation…..you must be really stupid if you did that and you should go to jail….Maybe you’ll learn something like how not to be stupid…..your one of the dopes thats going to keep weed illegal

  • Scott Eaton

    Do you think if I do a few bundles of Heroin before going to my probation officer for my drug test do you think it will show up ?

  • Scott Eaton

    To all you dopes : want to get a better result on a piss test ? Piss first and in the middle of your piss then take that piss and use it