The Brief A 39-year-old teacher at Great Hearts Trivium Preparatory Academy was arrested just days before the start of the school year. Goodyear police arrested Samuel Cooper on three counts of sexual exploitation of a minor following a cyber tip from Reddit. Tuesday, Aug. 5 was student orientation at Great Hearts Trivium Preparatory Academy. It was also the day Goodyear Police say they arrested 39-year-old teacher Samuel Cooper on three counts of sexual exploitation of a minor. Local perspective:As Great Hearts families prepare for the first day of school on Thursday, the Goodyear community remains unsettled over the arrest.