Arrest Logs - sacbee.com(South Sacramento CHP); James Knapp 07/12/10: Weapons (San Mateo SD); Edson Mogollon 07/11/10: Drunk (Placer SD); Dequiez Jackson ... A man who entered the Hall of Justice Monday and arrested for having a concealed weapon was named by the San Mateo County Sheriff’s Office yesterday. James Douglas Knapp, 44, entered the Hall of Justice security checkpoint and placed his backpack which contained a .45 caliber handgun and a loaded magazine into the X-ray machine, Monday afternoon, according to the Sheriff’s Office. Knapp was arrested for unauthorized possession of a loaded firearm in a state or public building and for carrying a concealed loaded firearm. Knapp was booked into the Maguire Correctional Facility without further incident. He was in the Hall of Justice to petition the court for a modification of his child custody order. He said he was unaware that a handgun and loaded magazine were in his backpack.