A man who alleges he was the victim of an illegal search is not entitled to learn the identity of the confidential informant who told police she saw a semi-automatic handgun in his home, a federal judge ruled.In a written opinion Tuesday, U.S. Magistrate Judge Susan E. Cox declined to compel two Chicago police officers to answer interrogatories designed to confirm Melvin E. Brimage’s suspicion that the informant was his daughter.Cox held officers Terrence Fowler and Zoe Batzer appropriately invoked the informer&rsquo …