Pinging Jsb...
This really isn't all that funny. I don't think they are as concerned with surgical implants as they are with artifical enhancements, like gel filled push-up bras.
In the last scare there was talk about baby bottles containing explosive liquid, so it's not that far a stretch that they would put an explosive gel in a female terrorist's bra. The bra could be easily removed and the gel used once the female is in the plane.
Go down to the lingerie department and feel some of those push up bras, they hold a mighty lot of gel and it could be easily removed and replaced with whatever gel they needed for their purposes.