This is why exceptional cases require exceptional responses, especially when a human that is going to get fatigued is involved. Don't just beep the same way ev

This is why exceptional cases require exceptional responses, especially when a human that is going to get fatigued is involved. Don't just beep the same way every scan beeps, make a different noise. Show a large red "STOP" sign on the screen along with the problem. When you need to alert a human to an event that only happens once in every few hundred cases, you can't be subtle.