> Where?

Are you familiar with any recent bomber story at all? All he needed was some matches and a small amount of plastique.

Someone put an incendiary in his underwear. There are tons of possibilities. If you can't name 3 ways other than shoes and underwear, you might be in the group that thinks the TSA is fine.

They scan your body for bulky objects under clothing and X-ray luggage. Shoes are the only other location to hide an explosive device.

How do they get cellphones into prison?

Mostly guards smuggling them in

Yes, but I think you get where I am coming from.