If you work in a secure facility I bet you know personally of one weakness in the system just by working their. Like the door people sneak out for a smoke break yet leave something jammed into the door to keep it from locking on you yet keeping the sensors from showing the door open, or a host of other potential gain entry points.
Having done some security penetration test in the past I can tell you the weakest link is always the human factor, how ready is your organization to stop unauthorized people from accessing your networks? [www.darkreading.com]