A former Unicoi County Middle School teacher and coach has been indicted on a theft charge after investigators say he stole more than $10,000 worth of gasoline.The release states Travis Griffith had been issued a fuel card as part of his role as an assistant baseball coach, but the school owned vehicle used diesel fuel, not the gasoline he purchased.According to a release from the Tennessee Comptroller of the Treasury, an investigation found that Travis Griffith had “used a school department fuel card to purchase at least $10,160 worth of gasoline for his personal vehicle.”