I can drive (both on the street and the track) and play the Guitar... but never at the same time (only have one pair of hands).
You need to step up, then, I can play bongos while driving, and I've seen guitarists play alright using only one hand.
In the end, as I have said before, all I seek is a way to deter stoned people from going out in public.
That seems like a pretty harsh sentence. Why not just deter stoned people from driving or operating heavy machinery, which is a situation in which they could actually be a threat?
A field sobriety test is the mother of all qualitative tests, really. Even if it is administered in view of the camera on the car (or a body camera if the police officer is wearing one) it is still not a robust test and they are often challenged in court on a number of grounds. A field sobriety test for pot would be at least as bad.
Field sobriety tests are very qualitative in the middle ground of moderate impairment, but if you clearly pass or clearly fail, it's pretty objective. If someone stumbles across a line or falls down immediately while standing on one leg, they are clearly not in a condition to safely drive. If they can juggle while standing on one leg reciting the alphabet in reverse, they are clearly fit to drive.
If pro-pot people really want pot treated the same as alcohol they should be behind this as well, rather than treating it like some magical faultless cure for everything.
The problem is that all tests devised so far run an extreme risk of false positives and don't accurately assess the mental state of the driver. If an accurate test could be created, it might receive a different response, but until that point, it should not be embraced as having any utility.
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