Master Key Systems
Here is a video from CDA about building Master Key Systems and how they work. Jerry goes into detail about the security flaws and mentions electronic access control systems, with card readers. You will find these systems are now on most hotels, dorms and office buildings. With the new technologies it is even cheaper to retrofit buildings now. We have been doing a lot of access control systems, for local government and health care facilities. Now smaller facilities are able to afford these security systems. Some even realize a savings, when considering the impact of employee turn over.