Everything starts out with good intentions it seems but slowly turns sour. Look at the number of fumbling Barney Fife TSA agents at your entry point the next time you fly.
Put one retired Marine DI with a loaded M-16 at the metal detector and call it a day. The money would be better spent on more uncover Sky Marshalls on planes.
As for the innocent baby, I really wouldn't put it past Al qaeda from inserting a bomb into the anal cavity of a baby.