Several factors could have been implemented that would have more than likely prevented this attack. Starting with the lighting in the hall. While there is no study that proves lighting reduces crime, the surveillance cameras would have been more effective with greater visibility increasing the chances of the attacker being detected. More security officers on the floor or stationed strategiacally would also increase the likelihood of Edwards being detected sooner and their presence nearby would have been a deterrent. Essentially this hallway was a large blind spot due to limited visibility and observation capability.
Liability is present at most likely every facility. It can range from a slip and fall case to an active shooter incident. Occupational Safety and Health Administration (OSHA) could fine a business, property management and property owners after an event occurs if they find safety and security violations. Examples of finable violations are obstructed paths to exits and emergency exits, gaps in camera coverage, the wrong type of hardware on doors and even improper lighting. Large in part most security devices and systems are not put in because it can be overwhelming when you think about the right system, the right devices, installation and implementation between all of the components just to name a few. Start small, ask an expert, talk to your insurance company. Insurance companies will reduce the price of policies and deductibles if a risk assessment is conducted.