How Long Does Hash Stay in Your System?

Detection Timetable Depends on Many Variables

Woman Smoking Hash Pipe
Woman Smoking Hash Pipe. © Getty Images

Determining exactly how long hash is detectable in the body depends on many variables, including which kind of drug test is being used. Hash, also known as hashish oil and hashish, can be detected for a shorter time with some tests, but can be "visible" for up to three months in other tests.

The timetable for detecting hash in the system is also dependent upon each person's metabolism, body mass, age, hydration level, physical activity, health conditions and other factors, making it almost impossible to determine an exact time hash will show up on a drug test.

Short answer: If you have hash in your system, the chances of it being detected on a drug test are high (pun intended). But here are some guidelines to help you understand how the tests work, and how

Difference Between Hash and Weed

First things first: It's a good idea to understand the differences between hash and weed, the other common form of marijuana. Weed is essentially an unprocessed form of marijuana, which includes the leaves and buds of the Cannabis Sativa and Cannabis Indica plants. Unless someone adds other "enhancements," the only preparation of to weed is for the leaves and buds to be dried.

Hash, on the other hand, is a preparation of marijuana made from the resin of the Cannabis Sativa or Cannabis Indica plant. Then there's hashish oil which is the strongest form of marijuana (since it's so concentrated. Hash oil is generally the least common form of  marijuana.

What is THC

The detection tests are looking for evidence of THC, or Tetrahydrocannabinol (which is the psychoactive compound in marijuana).

THC enters the body's bloodstream rapidly after smoking marijuana.

If marijuana is ingested, such as baked into brownies rather than smoked, it takes longer to be absorbed into the blood, usually from 20 minutes to an hour and a half.

THC is detectable in the blood for a short time, usually a few hours, because it is rapidly metabolized into molecules known as metabolites.

At least 80 different metabolites are formed from THC. These metabolites are stored in body fat and are gradually eliminated from the body.

But some THC metabolites are stored in body fat and have an elimination half-life of 10 to 13 days. Most researchers agree that urine tests for marijuana can detect the drug in the body for up to 13 days..

Hash Drug Test Estimates

Although it's not possible to guarantee results, especially since drug detection tests are growing more and more sophisticated all the time, there's an estimated range of times, or detection windows, during which hash usually can be detected by various testing methods.

Hash, like many other drugs, can be detected with a hair follicle drug test for up to 90 days. It will show up on most urine tests between two days and 11 weeks. Blood tests are not generally used since hash metabolizes so quickly, but can usually detect it within two days. And saliva tests are good between one and 10 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.

There is no known substance that will produce a "false positive" on a marijuana test. 


American Association for Clinical Chemistry "Drugs of Abuse Testing" Lab Tests Online. Revised  January 2013.

LabCorp, Inc. "Drugs of Abuse Reference Guide." Accessed March 2013.

OHS Health & Safety Services. "How long do drugs stay in your system - including alcohol?." Accessed March 2013.

Jacquette, D. and Allhoff, F. (Editors). Cannabis: Philosophy for Everyone. West Sussex: Wiley-Blackwell. 2010.

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