Justices rule telephone isn’t eavesdropping device — May 24, 1989SPRINGFIELD — The Illinois Supreme Court has ruled that a fully functional telephone is not an eavesdropping device under Illinois law.The court found that the state’s eavesdropping statutes were not violated when a police detective used an extension telephone to listen to a conversation between a defendant and his alleged co-conspirator.The court affirmed the defendant’s conviction on charges of arson and conspiracy to commit …