There is no blood test for THC intoxication?
Nothing probation. There is no scientific guideline for measured level vs effect. That is my understanding.
There is, but it’s more labor intensive and costly than a breathalyzer.
There’s also no national standard for pot DUI.
And cases are more expensive to try, and it’s harder to get a conviction.
Meanwhile, perps are very well aware of all this and more are choosing to drive stoned rather than drunk.
Per AI...
“Nationwide Fatality Involvement: Broad multi-year tracking demonstrated that the proportion of U.S. crash deaths involving cannabis grew significantly from 9% in 2000 to 21.5% by 2018, continuing an upward trajectory into the past decade.
Deceased Driver Positivity: Recent multi-year tracking of drivers killed in collisions found that over 41.9% tested positive for active delta-9-THC in their blood systems.
Sourced to the NIH and the American College of Surgeons respectively.