The TSA uses a "Master Key" system to inspect locked checked baggage without damaging the lock or the suitcase. If your bag is selected for a physical search and is secured with a TSA-approved lock (identifiable by the "Red Diamond" logo), the agent uses a specialized master key to open it, perform the inspection, and then re-lock it. If you use a non-TSA-approved lock, security personnel are authorized to cut or break the lock to gain access, which can damage your luggage. After a physical inspection is completed, the TSA is required to place a "Notice of Baggage Inspection" inside your suitcase to inform you that your bag was opened for security purposes. In 2026, many modern suitcases feature integrated TSA locks, but if you are using an older bag, using a TSA-approved padlock is the best way to ensure your belongings remain secure while remaining accessible to official security protocols during transit.