POLK COUNTY, Fla. A middle school teacher is behind bars after authorities say she had sexual relations with a juvenile. Detectives from the Polk County Sheriffs Office arrested 49-year-old Leslie Bushart of Lakeland Thursday. Please refer all inquiries regarding her employment to the Polk County School Board, officials said. The investigation into the teacher began on June 16 after the boys parents contacted the Polk County Sheriffs Office. During the graduation party, Bushart told another person that she had just performed oral sex on the teenage victim, the arrest affidavit said.