NEW CITY, N.Y. - An ex-prosecutor and former PTA president who is also the wife of a suburban police chief has been charged with having sex, smoking marijuana and drinking with high-school-age children. Beth Modica, 44, a former assistant district attorney in Rockland County and Queens, pleaded not guilty Tuesday to counts including statutory rape, sex abuse and endangering children. Her hands were cuffed in front of her in court, where the indictment was unsealed. She later posted $75,000 bail. Her husband is police chief of Spring Valley. He is "not implicated whatsoever," Rockland County District Attorney Thomas Zugibe said....