What’s the Evidence Mass Surveillance Works? Not Much

Officials are again pointing to the need for mass surveillance to take down terrorists. Here’s what we know about how well it works.

In Wake of Paris, How Prepared Are U.S. States, Cities?

Security specialists say the ability to prevent and react well depends on a communication system and local counterterrorism efforts that are still underdeveloped.

Hospitals Checking Security After St. Cloud Shooting

Hospital officials say the number of nurses and aides injured by patients or visitors spiked last year.