Originally Posted by
missionpa
I'm flying from PIT to LHR via YYZ so I don't think WTMD is going to be an option, at least not at PIT.
Then I would go ahead and wear it, and opt out. Even though they use AITs at PIT, you could still not be selected for one. If you get the WTMD, you'll likely just walk through with no problem. If you get the AIT, you almost certainly would be pulled out for a grope, so you might as well opt out and go straight for the grope.
Do come back and tell us what happens.