I managed pubs for quite a few years, where staff turn over is high, and the opportunity to dip fingers in the till is high.
Pubs and bars are tricky. They're often chaotic, noisy, low lighting etc. I worked in a busy place for about 7 years while I went through uni and afterwards. It was a great job. There were five of us who worked together often. But there was a problem with the money. The takings for nights where we had the same number of people through the place would vary hugely, so we were all suspects. The manager got an investigator on the case. I worked that out pretty quickly - he was easy to spot given he was twice as old as anyone else in the place and he hovered near the tills. Eventually, they called a meeting and confronted us with their suspicions. They told us that they could find no evidence of theft but suspected on the nights when takings were way down we were somehow stashing away quite a few thousand dollars.
So with the boys' permission, I had to explain.
'It's drugs', I said.
'Aha! I knew it,' said the boss.
'Um... No, you probably don't.' I said.
I explained how most nights there were drugs involved. On the nights when the takings were way up, we were all on speed. We worked like maniacs. Nobody stopped for breaks. We were like sped-up machines.
He pointed out a night when the takings were way down compared to every other night.
'Acid,' I said.
We swapped speed for acid that night and it was a mistake. One of the boys just wandered out onto the dancefloor and didn't come back. We didn't see him till the following week. One of the other boys freaked out every time the glass washing machine went on and he ended up cowering in the storeroom most of the night.
It was a great moral dilemma for the boss. I explained that if he supplied us with drugs it would probably result in a 40% boost in takings. He declined.
Ah, those were the days. Sorry to hijack the thread.