This former BBQ smoker is armed with a water gun to chase off bums and drug dealers in downtown Atlanta. ATLANTA, Georgia (CNN) -- It's midnight on the streets of Atlanta, and bar owner Rufus Terrill patrols his neighborhood with a rolling crime fighter of his own creation. Meet "Bum-bot," as Terrill describes it; others in his neighborhood call it simply, "Robocop." 1 of 2 It's a barbecue smoker mounted on a three-wheeled scooter, and armed with an infrared camera, spotlight, loudspeaker and aluminum water cannon that shoots a stream of icy water about 20 feet. Operated by remote...