Drug Recognition Experts (DREs) are trained to recognize impaired drivers. But what about a machine to confirm the suspicion?
Current blood tests recognize THC in the blood weeks after use.
There’s a device to detect THC in saliva, and a couple of “cannabis breathalyzers” on the horizon with much more narrow windows of detection.
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See full article – Driving Stoned: Specially Trained Cops On The Lookout For Drugged Drivers