A federal judge gave the go-ahead for registered sex offenders to challenge an Illinois Department of Corrections policy that restricts their access to the internet.In a written opinion last week, U.S. District Judge John Z. Lee denied the department’s motion to dismiss a proposed class-action lawsuit that contends the policy violates the constitutional rights of offenders who are on mandatory supervised release.Lee wrote discovery is needed before he can determine if the policy runs afoul of the First Amendment or …