At least 23 complaints have been filed against the sergeant in his 21 years on the force, including several for alleged illegal arrests, civil rights violations and improper use of a weapon, complaint data compiled by the Tribune shows. In 1998, while assigned to the Ogden District on the West Side, he was reprimanded for a complaint stemming from a “preventable traffic accident,” according to records. None of the other complaints resulted in any discipline, the records show.