I may as well add my comments about CATSA:

1. I always alarm through the WTMD in Canada. Always. I swear I could walk through that thing naked and it would go off. Nowhere else has that been a problem. In fact, a while back we travelled YYZ-HKG-SYD (stopover in HKG). I tested my theory by wearing the same shoes, same pants, and same watch (no additional metal) through all three checkpoints. I alarmed in YYZ, but not in HKG or SYD. Too damn sensitive!

2. Not that this is CATSA-specific, but they don't know what the hell they are doing. Two examples:

(a) When I alarm the WTMD, they like to wand or pat-down my bare skin (arms, even my feet once). What do people hide under their skin anyhow?
(b) When travelling with my two-year-old daughter, I was directed to allow her through the WTMD by herself. I followed directly behind her, but was stopped because I caused an alarm (again). The guy wouldn't let me take another step, despite the fact that my two-year-old daughter was now running off into the post-security area by herself. Had her grandparents not been on the other side (though, at least 25 metres away, and unbeknownst to the CATSA fool), I would have caused more of a stink.

3. Staffing levels often leave something to be desired. They can be damn slow at times.

I'd like to see the whole organisation disbanded and security turned over to the airlines and airport authorities. I don't have to be screened for security purposes by a federal agency when I board a ferry, train, or bus. Why should an aeroplane be any different?