The Amphi School District Wins One Round In Court, But More Legal Challenges Lie Ahead. By Jim Nintzel THE AMPHITHEATER School District won a round last week when Pima County Superior Court Judge John M. Quigley ruled that real estate broker Bill Arnold did not have a conflict of interest when he served as Amphi's exclusive agent. Former Pima County supervisor David Yetman had sued the school district, alleging that Arnold's contract, which allowed him to negotiate his fees with the sellers of the property, created a de facto conflict of interest for Arnold. As Yetman's attorney, Bill Risner, argued in papers filed with