Recently published research has developed the concentration-effect relationship for THC in breath. While devices for on-the-spot measuring of THC in breath already exist, nobody knew exactly how much THC they needed to measure in order to determine if a person was stoned....
from
http://feedproxy.google.com/~r/HIGHTIMESMagazine/~3/x1_yaUFOQu0/scientists-edge-closer-marijuana-breathalyzer
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