(May 9, 2018, 10:57 AM EDT) -- WASHINGTON, D.C. — The Age Discrimination in Employment Act’s (ADEA) Section 630(b) 20-employee minimum that applies to private employers also applies to state agencies and political subdivisions of the state, an Arizona fire district argues in its petitioner brief filed May 7 in the U.S. Supreme Court (Mount Lemmon Fire District v. John Guido, et al., No. 17-587, U.S. Sup.)....