potalyzer
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Stanford has developed a roadside breathalyzer for weed
Blood, breath and urine. These are the holy trinity of determining alcohol intoxication but are virtually useless when measuring the amount of THC in your system thanks the molecule's ability to remain present in bodily fluids for up to a month after consumption. However, a technological breakthrough from Stanford University could soon enable law enforcement to accurately determine how blunted you are as soon as they pull you over.