My parents are conservative and against legalization. I disagree with them hard but have gotten a better grasp of the conservative view. They also dislike alco

My parents are conservative and against legalization. I disagree with them hard but have gotten a better grasp of the conservative view. They also dislike alcohol use, especially due to drunk driving causing accidents. In the same way, they think allowing another substance to be legally consumed will increase impaired driving rates (even tho DUI is illegal). They think alcohol being legal has made it easier for high school students to obtain it. They think the same will happen with cannabis. They don't want substances (alcohol or otherwise) near their grandkids' brains. Alcohol has a breathalyzer test. There is no such spot test for cannabis intoxication. Which makes regulating drivers hard.