The Illinois Supreme Court put the state judiciary out of the business of creating new evidentiary privileges — because “the extension of an existing privilege or establishment of a new one is a matter best deferred to the legislature.” People ex rel. Birkett v. City of Chicago, 184 Ill.2d 521 (1998). But the high court hedged a year later by declaring: “this court will recognize a privilege to protect communications in certain rare instances.” Illinois Education Labor Relations Board v. Homer …