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Heck, I'm not sure how they communicate with each other. This is a big facility with dozens of custodians. Many are recent immigrants from a variety of countries. They tend to work in groups. ...

Ahhh! Very nice! I knew "Fire Marshall" was going to cause a few head scratches -- but I wanted to include it for an touch of authority. "Inspector" hadn't occured to me. Pretty clever. ;)
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We have some nice old Russian ladies doing custodial work in our building -- and they keep shutting off a light that is supposed to be on at all times.

I need:

"Attention: This light switch...