A private company contracted to service dashboard cameras for the Chicago Police Department does not owe a duty to private citizens, a federal judge held.In a written opinion last week, U.S. District Judge Manish S. Shah dismissed a negligence claim leveled against Coban Technologies Inc. by a man who alleges he was a victim of excessive force while being arrested by police.John Mederich contends there is no dashcam footage of his arrest because Coban failed to properly maintain the cameras in the squad cars at the scene …