The majority of checked baggage is only screened without any physical luggage search, but TSA may inspect any of your checked luggage during the screening process if they have any reason to suspect that something that’s not allowed has been packed. In case your luggage is physically inspected, TSA will place a notice of baggage inspection inside your luggage. If your luggage has been locked by a TSA-approved combination lock or padlock, the agent will use a master key to unlock it. If it’s not a TSA-approved lock, he or she is allowed to break the lock.