Officials at the state’s Police and Firemen’s Retirement System have launched an internal investigation following the disclosure that their chief investment officer was accused of a conflict of interest while working for a New York pension fund that once employed him in the same capacity. The review and investigation, PFRS said, are being led by the law firm of Windels Marx. Their findings will be presented to the their board of trustees. “We take this matter very seriously,” said Dan Banks, a PRFS spokesman. “Upon learning of it last Friday, we immediately requested that outside counsel under…