Study: Field Testing Kits Render False Positives for Marijuana, Cocaine

May 21, 2009 - by Richard Samdperil

A recent study has shown that certain drug tests of common household items, such as oregano, thyme, and patchouli, have demonstrated false positives for THC, the primary toxicant in marijuana and hashish. 

False Postitives

"False Positives, Equal False Justice" was released in March 2009.  At a press conference announcing the report's release, the authors and chemists demonstrated a number of these false drug results in live tests.  (To watch the press conference click here). 

Among the items testing positive for marijuana were M&M's, girl scout cookies, ginseng, and vanilla.  Over-the-counter drugs, like Tylenol PM, tested positive for the presence of cocaine.

What to Do if You've Been Accussed of Drug Possession

Field tests may lead to arrest, but they are not persuasive evidence of guilt.  If done properly, laboratory testing by a certified state or independent lab can distinguish between contraband and legal materials. 

If you have been accused of possessing or trafficking drugs, be sure to contact a lawyer who is familiar with state laboratory procedures and the flaws of roadside reagent tests.