Thank you.
With drunk drivers you have a reliable test, a breathalyzer test, that allows you to get convictions, a very high rate of conviction, because it's proven to be accurate.
There's no such test currently for marijuana. Is that right? Doesn't that account for your statement that driving while impaired on marijuana is probably much higher than the 2% reported? Isn't that the reason, because there's no reliable test and there's no way to prove it?