A security system is provided for managing information stored on mobile wireless devices upon exit from a building. The security system includes an exit system and a device management system. The exit system is configured to detect that a user has requested to exit a building. The exit system is also configured to detect that a particular mobile wireless device is in proximity to the user. The device management system is configured to determine, based upon policy data that specifies attributes of information that should not be removed from the building on mobile wireless devices, information on the mobile wireless device that is to be rendered inaccessible. The device management system is further configured to cause the determined information on the mobile wireless device to be rendered inaccessible. Rendering information on the mobile wireless device inaccessible may include, for example, deleting the information, encrypting the information or re-encrypting the information.