The shackles have a small diameter and are easy to clip using bolt cutters or similar equipment.
Luggage locks accepted by the TSA can be opened by the authorities using publicly known universal "master" keys.
Under agreement with the TSA, it is Travel Sentry that sets the standards for these locks and approves each design.
Every lock with the Travel Sentry identifying mark (red diamond) is accepted by the TSA.
Some TSA-accepted locks feature an indicator which will appear red if opened by a master key, so the owner will know that their bag has been accessed.