Former Delano police chief Mark DeRosia is facing a misdemeanor charge after being arrested in a sting operation where he allegedly engaged in an inappropriate online conversation with a detective posing as a teenager. Prosecutors say the 68-year-old talked about sex and arranged a meeting when he contacted a detective who was posing as a 15-year-old in March. He was arrested March 26 in the area of Olive and Knudsen drives.