If You're Smoking Marijuana, You May Not Be Able to Cover Its Traces Anymore
posted August 21, 2007 - 3:59amMarijuana can leave traces of chemicals that tell others that you have had this substance nearby somewhere. These calling cards are chemical isotopes. Find out more by reading the article.
Website: http://www.nytimes.com/2007/08/21/science/21mari.h...
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