Facial recognition technology can be used to prevent criminal activity. But, in London, one study shows the police system gets it wrong 81 percent of the time.
While once relatively concentrated in a few countries like China and Russia, digital authoritarianism online is spreading.
Hackers got access to photos of border crossers and their license plates this week, raising questions about border authorities' plans to collect reams of sensitive biometric information.
The NYC subway saboteur gazed into the surveillance state. What looked back?
School districts and parents around the country are investing in bulletproof backpacks and whiteboards, security consulting, and safe rooms. But will any of it work?