An unidentified man breached airport security at Newark Airport on Sunday, prompting an evacuation of a terminal and flight delays that continued into the next day. This kind of security breach is inevitable, simply because human guards are not perfect. The perpetrator often doesn t even know he did anything wrong. American airports can do more to secure against this risk, but I m reasonably sure it s not worth it. We could double the guards to reduce the risk of inattentiveness, and redesign the airports to make this kind of thing less likely.
Source: https://threatpost.com/fixing-security-problem-isnt-always-right-answer-010510/73323/