A discovery dispute that started in an Indiana commercial tribunal wound up in federal court in Chicago when the defendants (St. Vincent Medical Group, St. Vincent Carmel Hospital and Hannah Thornton, R.N., N.P.) asked for an order — under the federal confidentiality law that provides special protection for treatment records of substance abuse programs — requiring Positive Sobriety Institute (called PSI) to hand over records concerning its evaluation and treatment of Jane Doe, a physician who sued the …