I remember watching a tv program once that was done during a rash of Post Office shootings.
The showed one of the mail sorting facilities and the people at their stations. Every single movement they made over the entire day was broken down into a procedure that had to be followed.
When they wanted to go to the bathroom, they had a line on the floor that led from their area to the nearest restroom. They had to walk directly on the line, and return directly on the line.
That has always stuck in my head.