Part-time residents often rely on private security agencies to monitor their home while they are away. The Knox Residential Program can be implemented by the agency to provide access to the home in the event of a security alarm. Some security agencies also implement the Knox Residential Program so they can assist in the event of a lockout. Many customers choose this option as an added benefit to their security service. This is safer and more reliable than hiding an unsecure key to the home on-site.