After the various departments have done their idiot checks and driven off, the Locations Department does a final idiot check...to find the stuff the other guys missed. And, yes, we end up missing stuff too.
On the occasions when the location is somewhere that's going to get locked up tight after we leave, like...oh...say, a prison...the idiot check is more about making sure we haven't left behind any idiots. That can be embarrassing for the production and inconvenient as hell for the forgotten crew member.
I'll assume other business have their own versions of the idiot check, designed for the same thing, but with all of the different definitions of "check", there are probably totally different interpretations of the phrase "idiot check". For instance, I really don't care how much money you've got to throw around, but this strikes me as being something of an idiot check.
Or look at this one. Clever maybe, but still an idiot check:
Which would make locking Sarah Palin in a car without the keys a form of idiot check. She might never get out!
See what I did there with the "smart car"? Huh? Huh?
Idiot Checkmate might be Todd Palin locked on a snowmobile without the keys. Won't somebody please let him out?
I suppose we'd be getting into homophones if we started talking about Idiot Czechs.