And as discussed in the TS&S forum, if anonymous criminals can steal items FROM checked luggage and leave the airport with impunity, unscreened bad guys could arrange to stick things INTO checked luggage. 100% background checking, video, and patdowns of TSA baggage screeners and handling staff would be another good layer of security. But it won't be done because it doesn't add to the public theater aspect of American security, and airlines like Delta find it cheaper to just issue checks when items get pilfered.