Indeed. Be prepared for a lot of slow speed chases.......
I recall, vaguely, driving between Qualicum Beach and Nanaimo and being waived over to a "what I did not know was a spot check" and driving right on through.
The situation was we had been bowling and the pot had taken it's toll. We always smoked before going bowling. The objective was if one forgets to push the 'pin change button' there was some sort of points deduction. It eventually degraded into the last frames where no one would remember to push the button and we would all stare at the pins.
Anyways I was driving as we returned home and I came upon the police waving cars off and around a vacant building which had another driveway to exit making it a good spot for the SPOT check because if people were sober they could just drive out, after being checked.
Being from a small town I had never heard of or been through a spot check. I had no idea why they were waving me off the road (it was daylight and I couldn't see any reason) so I followed their directions and continued driving around the building and back onto the road.
Someone in the car said "that was a spot check you were supposed to stop"! I looked in the mirror and the cops were standing there watching us leave but they never chased us. Maybe there was only 2 cops working that stop and that's why they didn't.
My experience overall is pot smokers, myself included drive very slow without realizing it but it is still something I would not do today.
One story that made me snicker was around 5-6 years ago a car was pulled over for going 30 on the 401 near Kingston. Turns out there was 50 lbs of pot in the car. I immediately knew why they were going 30......
AAA Foundation study reveals the dangers of getting less than seven hours of sleep
"You cannot miss sleep and still expect to be able to safely function behind the wheel," "Our new research shows that a driver who has slept for less than five hours has a crash risk comparable to someone driving drunk."
Acute Sleep Deprivation and Risk of Motor Vehicle Crash Involvement,
The AAA Foundation report found that in a 24-hour period, crash risk for sleep-deprived drivers increased steadily when compared to drivers who slept the recommended seven hours or more:
Six to seven hours of sleep: 1.3 times the crash risk
Five to six hours of sleep: 1.9 times the crash risk
Four to five hours of sleep: 4.3 times the crash risk
Less than four hours of sleep: 11.5 times the crash risk
https://westerncentralny.aaa.com/news-room/releases/2016-12/missing-1-2-hours-sleep-doubles-crash-risk
I guess you don't get a nick name like "Putz" for nothing. 
