Michigan has lost its fight to put tougher restrictions on sex offenders.
The U.S. Supreme Court rejected the state's request for a stay on a lower-court ruling that found restrictions unconstitutional.
State laws passed in 2006 and 2011 banned convicted sex-offenders from being within a thousand feet of schools and forced them to report to police after buying a new car or opening a new e-mail account.
The issue is that the new rules applied to people who were convicted before they were enacted.
An appeals court rules that violates the constitution's ban on ex-post facto laws.