The Homeland Security Department is falling short on securing federal buildings from cyber attack. Your office may be vulnerable to attacks that would keep you from getting in or out, or could make the climate in the building unbearable. It may even encounter other problems that could impact the ability of your agency to meet its mission. Mark Goldstein is director of Physical Infrastructure Issues at the Government Accountability Office. On In Depth with Francis Rose, he said building security is far more complicated than it used to be.