If it's actually dice-roll random, I can see that working pretty well. It's actually fairly common to use "random coin-flip" type machines in retail -- you do r

If it's actually dice-roll random, I can see that working pretty well. It's actually fairly common to use "random coin-flip" type machines in retail -- you do random bag-checks of staff, and they push the button on the machine. Either "search" or "no search" lights up. The probability is set according to the risk factor of the store, anywhere between "nobody gets searched, this is just to scare you" and "everyone gets searched, no buts". In my experience, it usually gets set to about 15% probability. Just enough that a few people get searched every week, not enough that everyone has to stay behind for an hour waiting for bag searches.