The Entertainment Software Association has sued and has been successful in keeping laws restricting the sales of "M' rated games from being implemented in many states. Now the US game trade organization is putting up its legal dukes once again, this time over some new rules that have been passed by the Chicago Transit Authority.

Specifically, the CTA passed Ordinance 008-147 in January. That move would ban any bus ads that promote games that were rated "M" or "AO". The ESA's suit contents that the ordinance violates First Amendment free speech laws, stating it "restricts speech in a public forum that is otherwise open to all speakers without a compelling interest for doing so." So far the CTA has not responded to the lawsuit.