A former Cottonwood High School teacher will spend a year in jail for having a sexual encounter with a 15-year-old student. Corbin Vance Robinson, 38, pleaded guilty in March to a single count of third-degree felony sexual abuse of a minor student. He was originally charged with nine counts, but the remaining eight were dismissed as part of a plea deal. In court papers, Robinson admitted to having sexual contact with the girl on one occasion last October.