Our company is strict with accommodating visitors in the building. Everyone goes through the security in the lobby. Most of the time, the security officers assigned would call us first to verify if we were expecting visitors.
Our building is equipped with a swipe card system and barcode scanner which reads the strip in each of the employees' identification cards. Not only that, we have a reception area to filter those who are already in the building and CCTV cameras are also installed to check the comings and goings in each room.
Before the 9-11 event, our office was just like any ordinary building. We only employed security guards and trusted everyone who would come in and go.
Times have changed. Tight security measures are not being implemented and improved for those which are already in place and installed.