They should ask the expert. They can reach him at 1600 Pennsylvania Ave.
Has any state developed a breath test to determine the level of wacky weed for a driver?
If not, and when that happens, they will make it legal in most states. That way they can arrest and collect fines.
Soon after Colorado legalized, I read an article that the NTSB had started a program to determine what the safe level was. A couple months later I read a follow up that it was being suspended, because while the people that drank alcohol and smoked marijuana as a whole did much worse after adding the marijuana, a large percentage of the people that just smoked marijuana drove better after they smoked. I knew at that point we would never hear of that study again...
It takes the edge off the rush hour traffic out here in Bernie Land. (WA)