What do you do with "The PSA says don't drive on cannibis, it doesn't mention what I was doing on cannibis"?

What if someone presented that as a defence somewhere?
Has someone done that already?
Instead of “don’t drive impaired” or “don’t drive drunk” or “don’t drive on cannibis”, what should the PSA say to cover everything that one should not do while impaired? See the tags, and more endless list of things.