Well, I do see a lot of potential problems with law enforced using ghettos as an "arrest shop" and the like but that's not really on the technology or your company. In general it's seems like a good thing, nobody wants unresponsive people zipping around in +1 tonne metal boxes.

I'm curious about the "similarly impairing dose" though. Any good research, actual test results, etc?

I'm assuming it's response times which make me curious how the response time of a 25 year old post 3 hour cannabis smoker compares to a +70 year old on a regular day and how that compares to someone at the legal limit for alcohol.