Obviously. I stand by Bart. The public should have an idea of what's going on within reason but specifics should definitely be kept secret.

Good: "This CTX machine took 3-d images of your bag. Unfortunately, the screener found some suspicious items that he couldn't resolve. Please give us your keys and combination lock # to open your bag and wait till your bag is cleared. Unfortunately, for security reasons you'll be unable to touch your items; however, please instruct us how to repack your bag and relock."
Bad: "This machine fails x% at detecting explosive compound y."

Good: "I'll be searching your baggage for the suspicious item that the CTX operator couldn't resolve. Then, I'll be swabbing the the entire contents of your bag to have it tested for chemicals that are found in explosives."
Bad: "Here are the items in your bag that the operator couldn't resolve."
Bad: "The ETD machine can only detect explosive compound y if its presence is more than xx grams."

- Pat