South Dakota man invents device to saves lives during active shooter situation

(KORN) — A Mitchell man’s patented invention has the potential to save lives during an active-shooter situation. Jeff Harris is a custodian at Dakota Wesleyan University. He was approached by a faculty member who told him the classroom doors don’t lock….

He filed the patent three years ago and recently received the final document. Harris says it took him a matter of hours to come up with the device. He says it’s not about the money, it’s about saving people….

Harris’s invention has caught the attention of national media including cable business channel CNBC.