Prosper Police say a staff member exposed four preschool students to THC on Halloween, and they arrested the employee at the school. Officers were called to the Primrose School of Prosper after four students from the same classroom suddenly became ill and were taken to the hospital. The hospital discharged three, and one remains in stable condition. Anisah Burks, a staff member at the school, was arrested for felony Possession of a Controlled Substance and four counts of Injury to a Child.