Where a plaintiff was designated as a sexual predator due to a felony conviction that occurred after a newly enacted Illinois law, the law did not violate ex post facto clause.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Ronald A. Guzman.Anthony Johnson was convicted of rape, deviate sexual assault and aggravated kidnapping in 1983, when he was 19 years old. Illinois law required him to register as a sex offender for 10 years because of that conviction, something he did.In 2011, Illinois …