An instructor at a vocational school in Westbrook is charged with gross sexual assault.32-year old Derek Hanscom was arrested Monday. Westbrook’s school superintendent confirmed the Gorham man is an automotive instructor at the westbrook regional vocational center and is still employed there. In addition to gross sexual assault, Hanscom is also charged with three counts of unlawful sexual touching. Police say the arrest was the result of an investigation into incidents that happened in the past two weeks. The victim is a juvenile. No other details have been released.