In response to the guy who attempted to blow up a plane but only managed to blow up his groin on Christmas day, various countries have stepped up their "security" in an attempt to prevent this exact type of scenario happening again. The US have cracked down on people doing things in flight, forcing you to stay in your seat for the last hour and not have anything in your lap.
The Brits are beefing up preflight security (again). And their doing this with fancy new full body scanners that can see through your clothes and provide something that is a lot closer to a nude image of you than a clothed one. These images exist in a very fine line between decent and indecent, and are more likely to fall on the indecent side, as I'm sure the photos released to the press are not as clear as what is actually produced (it's a standard tactic to understate your capabilities).
And now the Brits want to use these machines on everyone, which is causing a problem. For most people, while they don't like have indecent images taken of them by low paid security guards and feel like it's an invasion of privacy, it's not actually illegal to do so. But there is a subsection of the population for which it is illegal to make an indecent image of. Who? Children.
That's right. Terrorism is butting heads with Child Pornography. Won't somebody think of the children? When the two biggest boogeymen of our day butt heads, who will win? Right now, Terrorism is losing as the suggestions for dealing with this is to just not scan children with the machines, but I expect Terrorism will come back strong once an under-18 terrorist wannabe pops up somewhere.
I think a better solution would be not to use these $150,000+ machines and not make indecent images of anyone, but then what would I know?