Actually, there's all that slowing of reaction times, loss of ability to concentrate, etc.
There ARE significant impairments in functioning when using marijuana, and for a goodly amount of time afterwards.
Consider: when was the last time you saw this on Action News ... "And the drug test is back on the Septa Driver that crashed his bus into a stationwagon full of disabled nuns. It was found to be negative."
Farfromhome is talking about guys who drive trucks. He doesn't state, but I'm assuming long haul. There are enough problems controlling one of those beasts on the highway sober, well rested, and with good judgment.
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