Saw it in my dad.
It is real simple pot smokers should not be allowed to drive at all. period.
Just based on your opinion? No need to base such a dramatic new restriction of personal liberties on objective scientific data? No one is saying they should drive while impaired.
There are all sorts of psychotropic drugs which are regulated and require drs to report who is taking them to the state authorities.
Particularly people who take anti-seizure drugs and they can only get their license back after six months of being seizure free without the use of the pills.
Potheads are no different.
Driving is a privilege not a right.