It will be treated like alcohol and you will be tested for impairment not prior use. If you are not impaired then at the time of an accident then you cannot be charged or sued.
The big problem is pot is about the only drug that stays so long in your system. Crack heads test clean in 48 hours ans so do most other junkies. Or boozers.
If you have a script for opiods and test for opiods then you are good to go because it's an doctor prescribed medication. My pot is doctor prescribed but I'd be canned if I fail a test for pot. WTF!
The BS of it is is that those drug tests don't pick up THC. They pick up the metabolites of THC that get stored in the fat cells of your body and slowly leach out into your blood then get excreted by your kidneys into your urine a bit at a time over weeks or even months depending on the rate of your usage and the amount of body fat you pack around. A skinny old fart like me that smokes little but uses a lot of edibles can be clean in a couple weeks. My lard-ass buddy that smokes a few joints a month can test positive for 3 or 4 months.
They keep trying to equate pot to alcohol when it comes to impairment and it's like comparing apples to oranges. Totally different things. If you blow .08 you got a buzz from booze that is scientifically proven to cause impairment in a smaller man like myself or my lard-ass buddy. There's nothing like it to test for pot smokers. Two small hits in my pipe has me almost wasted where plenty of guys my size can bogart a big fattie of the same pot and be barely feeling it. I've been smoking pot just shy of 50 years and have almost no tolerance. Maybe because I have at least 7 or 8 strains plush hash, kief, cocobudder, BHO etc at hand all the time I never build up enough tolerance I don't know. About 75% of the pot I consume is cocobudder as it works way better for me than smoked pot to help my arthritis and depression.
When I was working in the oil patch they had saliva test strips that they used in cases where maybe the boss walked round the corner and caught you blasting a J with a buddy. It just indicated the presence of THC and if tested a couple hours later would be negative. That's the kind of test the cops should be using like the hand-held breathalyzer to see if you've done pot recently then if that is positive they send you for further testing like blood. Speaking of blood I'm off to the clinic soon to donate my 47th pint so go help your fellow man and give a pint as often as you can. You will feel better both physically and spiritually knowing that you just wiped out a lot of minor sins off St. Peter's list!
3 bears after a donation will make you legless!
In twenty years they will have it all figured out but I'll be pushing up pot plants long before then. Just happy to smoke a legal joint before I cash in my chips. Don't grind me up for fertilizer if you want to grow organic!