Originally Posted by studentff
Personally I would not object to them doing an ETD check on all carry-on bags. It's effective, fast, and extremely non-intrusive. (I don't particularly like the false-positive protocol, but that's a separate issue.)
X-ray examination is the primary screening method for all accessible property (carry-ons). Random secondary screening of accessible property is a sound, prudent measure. Mandatory secondary screening for every single piece of accessible property is overkill. There are some people in my organization who advocate this, foolishly I might add. Please, let's not go there!