What do you think about these hospital killings?

It is weird. It is at times like this when hospital corridors need cameras recording comings and goings. We trust the nurse or doctor and the hospitals must give them the security they need to get on with their jobs. So I have been thinking Every patient should be introduced to the nurse who will be caring for them and anyone else entering the ward/room the patient must press the emergency buzzer. Certainly more security is needed. A ward register could be kept and each person entering the room can be logged by them signing their names. Anyone posing as health staff and not on the list of health staff should not be allowed in and reported using the emergency bell.