“Wrong - several legalizing states have set blood concentration limits on THC just as is done with alcohol.”
They had to come up with SOME kind of a number; those numbers are still very controversial. BAC has been examined for 80 years. And testing for THC isn’t as simple as blowing into a machine. If the popo are going to draw blood at every traffic stop then we are in a great deal of trouble. There are not quite perfected THC breath analyzers but who knows how that will play out.
How is this controversy relevant to the legalization question?
If the popo are going to draw blood at every traffic stop
Chicken Little-ism - they don't administer an alcohol breathalyzer at every traffic stop.