An appeals court Thursday urged Chicago’s top federal trial judge to consider prohibiting lawyers from investigating jurors serving on their cases.The 7th U.S. Circuit Court of Appeals upheld a jury’s verdict in favor of two corporations sued by a man who alleges exposure to asbestos was a substantial cause of his lung cancer.A judgment in favor of ExxonMobil Corp. and Owens-Illinois Inc. was “inevitable” after it became clear Charles Krik could not prove causation, the court wrote.However, the …