A 34-year-old eighth grade teacher at a Mission Viejo junior high school has been arrested on suspicion of lewd acts with a student, authorities said. Kristen Roush, 34, was taken into custody on Friday at her residence in Aliso Viejo. Orange County Sheriffs Department investigators were contacted in July after the male victims parents became concerned over what they perceived as an inappropriate relationship between their son and Roush, authorities said.