After September 11, federal marshals were assigned to ride on planes to reassure jittery passengers it was safe to fly. Fourteen years later, some Congress members — and some of the marshals themselves — are asking if they’re really necessary.
Security technologist Bruce Schneier, who is a fellow at Harvard's Berkman Center for the Internet and Society, offers some thoughts on the program that has cost taxpayers $9 billion over the past ten years.