[dogma1138]

Some gates don't have metal detectors anymore it seems that they are being phased out slowly but surely. And in some cases even if you have the option to opt out you might not even know that you are in a body scanner line as some lines might start where the scanner isn't visible yet. The problem in my opinion is that body scanners are considerably less effective than metal detectors.

A personal experience from going through on in Germany is that it flagged the passport and boarding pass that i had in my breast pocket which lead to the guy patting my chest like he was a 15 year old getting to 2nd base. The scanner however had no objection to my key chain which I have had a leatherman micra on which technically has a knife (its only 4cm long and is legal to carry even on air travel or at least it was never flagged for me).