[raddad]

>a good idea for jobs where worker impairment presents an imminent physical danger

When I was in school some of the bus drivers were drunk, stoned or tripping on LSD. It really was a lot like the bus driver in The Simpsons.

Back then truckers would do the same and stay awake driving for days; some of the stories I've heard make me wonder how they ever survived long enough to get clean.

>criminal background checks

I know of a woman who became a school bus aide after a background check and she was in prison for attempted murder and human trafficking so I don't put a lot of confidence in these preventing employment, only will cut down on applications.