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How Long Weed Stays in Your System: Get the Facts

Whether you are preparing for an upcoming drug test or are simply curious about the effects of this drug on your health, you may be wondering just how long marijuana stays in your system. There is a wide range of research on this question, and learning a bit about the established facts can help you make more informed choices about your own usage. Visit this site to get started.


It's commonly believed that it lingers for up to 30 days, but this oversimplifies the matter somewhat. In truth, there are several different tests available. These tests can be more or less sensitive to low levels of marijuana, and so there is no clear time period that applies to all of them. Moreover, these different methods often detect different cannabinoids, which are the chemical molecules that are found in marijuana. Typically, urine tests look for a substance called THC COOH. On the other hand, blood tests detect THC, which is psychoactive.

Making things even murkier, everyone's metabolism works in slightly different ways, meaning that one person's time to clear the drug from his system may not apply to another. You might think that restricting the question to people of similar age, sex, and other physical characteristics would solve the problem. Unfortunately, lifestyle and other individual factors can complicate the story. For example, individuals with higher levels of bodyfat are known to store these cannabinoids more easily.

What Does the Research Say?

Keeping the above warnings in mind, there have been many studies carried out to explore the question of just how long the drug remains in the body. These can help you moderate your level of usage if having a certain level of marijuana in your system is important to you for whatever reason.

A commonly-cited study from 1989 found that when the sensitivity of the test is 20 ng/mL, a maximum window for detection is roughly 25 days. That said, it only took about 10 days on average for most participants to stop testing positive. An earlier study from 1984 used a sensitivity of 50 ng/mL and found that most participants needed no more than about 13 days to start testing negative.

Finally, one prominent review from the University of Missouri in 2005 found that that the upper limit of 30 days is largely sound, but also noted that some people tested positive even after 30 days. Find out more about this at this website.

Overall, there is no clear number of days after which you can expect to test negative. Because of this, anyone who would like to have low levels of marijuana in their system in the near future should significantly curtail their consumption well in advance.
  
Visit http://en.wikipedia.org/wiki/Medical_cannabis to read more about this.