Paul,
I've met the odd OSH inspector in the course of my work and most of them in my opinion are pretty down-to-earth people.
You might get the odd idiot (usually young, in-experienced pups) that starts firing off warnings and so forth.
Personally I wouldn't like to have to do thier job.
Up-shot of this post is merely to say that I've found the majority of the inspectors I've met to be thoroughly professional.
No doubt anyone that was too "power-crazed" would soon be cut down a peg or two, wether by thier peers or someone "on-site".