Charges have been laid against a Durham Regional Police on-duty special constable after allegations that he assaulted a prisoner. The Durham Regional Police Service’s Professional Standards Unit launched an investigation in March into an incident alleged by a teenage male regarding the conduct of 47-year old Chris Silverthorn while on duty. Silverthorn has been a special constable with the branch since 2005. He was charged with aggravated assault and released on a promise to appear. The charges against him have not been proven.