Prosecutors have dropped a charge against a former Charlotte, N.C., schoolteacher now living in Statesboro who had been accused of improper conduct with a former student 30 years ago. Monte Sue Diebolt, 73, had been charged in January in Charlotte with a felony count of taking indecent liberties with a child. The charge was dropped Wednesday because there was no way to corroborate statements made by the former student, according to the Charlotte-Mecklenburg District Attorney’s Office.