Any residents of St. Helena Parish caught riding around the parish with assault weapons will be arrested, Sheriff Nat Williams warned Tuesday. “As far as them riding around with an assault rifle, it will not be tolerated,” he said. “Somebody with an assault weapon is no different from a criminal and will be treated the same way.” Some residents of the parish’s 6th Ward, angered by a rash of recent break-ins, have conducted informal patrols, sometimes while armed with AR-15 semiautomatic rifles, the civilian version of the U.S. military’s M-16. “If somebody is out riding around with an assault weapon,...