A top aide to New Jersey governor Chris Christie is the latest in a string of government staffers to use personal email accounts and other digital services that sidestep public records laws — regulations designed to keep government business transparent. In this instance, emails from the Yahoo Mail account of Bridget Anne Kelly — Christies former deputy chief of staff who was fired by the governor last week — indicate a correspondence related to the controversial closure of lanes on the George Washington Bridge that connects Manhattan to Fort Lee, New Jersey.