In the weeks after the Connecticut school shooting, as the nation puzzled over how it happened and what might prevent it from happening again, Kamal Sarabandi was listening to the news. Talk turned to giving teachers guns, and he paused.
"I said, there must be a better way," Sarabandi recalled.
Then he had an epiphany. Sarabandi is an electrical engineering professor at the University of Michigan. His specialty is remote sensing—detecting objects and gathering information from a distance. And for several years ending in mid-2012, he was funded by the Department of Defense to tweak a type of radar not too different from the kind police use to nab speeders and use it to find weapons and bombs concealed on a person's body.