The Palm Beach County sheriff's deputy moved his flashlight from side to side. The man he was field-testing for evidence of drunken driving grew more frustrated. Then he thumped the side of the deputy's head."You're under arrest for DUI," PBSO deputy Patrick Zeitz said. Then, "You're lucky I'm not charging you with something stupid like Batt-Leo."That would be battery on a law-enforcement officer, a third-degree felony punishable by up to five years in prison."You, as somebody who does this profession, should know better," Zeitz said.