The point is that we have no reliable way of confirming impairment during the operation of a motor vehicle and until we do it's simply open season because the officer thought he smelled weed and now has probable cause and some poor bastard who smoked as long as two months ago is jackhammered in the ass with DUI penalties that they don't remotely deserve.

For someone who isn't a regular smoker and has a high metabolism, it can be around 2 weeks, and can go up to like 2 months I think. But your point stands, there's currently no real way to test the immediate actual intoxication of marijuana

You know, I could honestly believe this. The man was by no means smart, but he was very clever