Update: Justin M. Tresnowski was erroneously listed in the second to last paragraph as a special state’s attorney representing Cook County Inspector General Patrick M. Blanchard in an appeal before the Illinois Supreme Court. Tresnowski withdrew all involvement from the case when he became a federal court law clerk.The Illinois Supreme Court this morning upheld the constitutional authority of Cook County’s independent inspector general to subpoena and investigate other countywide offices.The court’s …