Wev'e all seen this before, looks like it's becoming a possible issue again. The U.S. Justice Department is turning to technology to help guns recognize whose finger is on the trigger. The National Institute of Justice, the research and development arm of the Justice Department, is teaming up with Metal Storm, an electronic gun maker, to study how a firearm could be designed to determine whether the person wielding it should be allowed to fire it. "If an officer drops a gun or it is taken away from him during a tussle, a 'smart' gun could not be turned against him because there would be means of specifically identifying the authorized user," said Charles Vehlow, Metal Storm's chief corporate officer. "The study will identify the various technologies that could make this possible and recommend the best ones to use."