I think you've misinterpreted Plato's quote, Art. Also, I was merely responsible for giving my friend the substance, not for the reckless behavior. Did I make that unclear in the first post? I did not ask him to drive foolishly. It's a bit hard to tell someone to stop something when it's done before you know it.
In light of all this: Yes, it's foolish to drive with illegal substances, even more so if you're violating traffic laws.