So I set up 2 scanner machines in my delivery area to stop contraband smuggling. I have completed all the requirements for them to work: I have connected them to a scanner monitor, which is being watched all the time by a guard (paying attention to tiredness), I have placed them in my deliveries, they receive power and workers are loading deliveries in them. They go through the machine, as they should, but they don't detect any contraband. I have used CI to sort this out, and I was watching crates go through the scanner with contraband in them, and nothing happens. After that, they deliver it to the needed spot, with the contraband still in them. What am I doing wrong?