Three weeks after a 10-year-old Alexandria boy was arrested for showing a toy gun to another student on a school bus, prosecutors dropped charges against the child Tuesday and his record was scrubbed clean. “We did not feel it was appropriate or productive to proceed with criminal prosecution and believe the matter can be best handled administratively within the school system,” said Alexandria Commonwealth’s Attorney S. Randolph Sengel. The child’s mother, Nakicha Gilbert, said that she was glad her son’s courtroom travails had ended but that “it should’ve never happened” in the first place. The fifth-grader at Douglas MacArthur Elementary...