What I meant was that it seems it would contribute more to security to disable/eliminate the USB ports, than to try to stop people from trying to bring in USB drives
In a secure facility anything that can record should never be brought in. If it is, the device should never leave. If it is personal property, too bad.
You have to take additional measures to guard against disgruntled people. It only takes one to compromise security, Operation Plans, Intelligence, etc. That is the weakest link of any secure facility.