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Originally Posted by dr wadd
There is currently a device undergoing trial for that very purpose. It's a PocketPC loaded with a variety of cognitive tests, and by analysing the difference in performance across a range of tests the aim is to be able to identify if the user has been taking any drugs, and what sort of drugs they are.
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Interesting, a high tech version of 'walk in a straight line' & 'touch your nose with your eyes closed'.
I imagine that such methods would be essential if the assessment of Cannabis 'intoxication' was to be made on drivers. The problem at the moment is that Cannabis persists in the bloodstream long after the effects have worn off, so blood testing is impractical.