That's kind of what I was referring to that you can't use alcohol as an arguing point because that shouldn't be legal either. But regarding the "how do you measure" the legal limit of mj you would also need to create a new scenario that combines an alcohol limit and mj limit together. So that really opens up a can of worms. Using both substances at the same time would change the existing alcohol limit. And it would probably take years for them to test and find the limit of mj level. But I'm sure they would have no problem finding volunteers to figure out the limit!
