By providing a padlock having a primary shackle and a secondary shackle which is easily employed whenever the primary shackle has been cut, an effective, easily produced, key operated or combination controlled padlock is achieved which enables the padlock to be quickly and easily opened for inspection by security personnel, while also enabling the padlock to be quickly relocked after inspection using a secondary locking shackle. In addition, the secondary locking shackle provides the user with notice that the padlock and suitcase had been opened by security personnel. In accordance with the present invention, the padlock incorporates a housing and a primary shackle which is constructed for being lockingly engaged with the housing, as well as dis-engaged from the housing whenever the padlock is opened.