(Smithfield, RI) -- A state trooper is facing charges after an altercation involving his father. Smithfield Police say around 1 a.m. Sunday they responded to an altercation on Lakeside Drive and found "probable cause" that an assault happened involving 25-year-old Timothy Jamieson and his father 50-year-old William C. Jamieson. The elder Jamieson, who suffered minor injuries, is a retired state police major. Timothy Jamieson is on administrative leave.