SIOUX FALLS, S.D. (AP) — The South Dakota attorney general is charging a former Sioux Falls police officer with assaulting a man he was arresting last year. Attorney General Jason Ravnsborg says his office will prosecute former Officer Joseph Larson on a simple assault charge. According to court documents, Larson was arresting a man in late July when he allegedly used improper force by repeatedly striking the man in his groin while trying to buckle him into the back of a patrol car. It was not clear whether Larson had legal representation. Attempts to reach him were unsuccessful Thursday.