(May 2, 2016, 11:10 AM EDT) -- DETROIT — A Michigan federal judge on April 28 certified a class consisting of thousands of Michigan residents in a lawsuit accusing two debt collectors of sending collection notices for time-barred debts (Joseph Luther v. Convergent Outsourcing, Inc., et al., No. 15-10902, E.D. Mich.; 2016 U.S. Dist. LEXIS 56456)....