The TSA requires any lock on luggage to be branded as “travel sentry approved”, so they search the bag without breaking the lock. Those master keys for the TSA to get into the bags have been closely guarded by the TSA. A photograph though appeared in a 2014 Washington Post article of seven of those keys. When lock pickers discovered the photo, they were able to copy the keys .One person even shared the files on how to on a code sharing site. Now anyone with a 3d printer can print all 7 of those master keys.