So just to update you Minnesota attempted to get a law passed and it failed.  So they thought "hey" lets appeal and well that failed to.

The Minnesota law would have imposed up to a $25 fine on minors younger than 17 caught buying or renting video games rated "M" for mature or "AO" for adults-only, under the video game industry's rating system.

You would think other states and cities would pay attention to this but "this week, a committee in Massachusetts is planning to consider a bill, endorsed by Boston Mayor Thomas Menino, that would--you guessed it--restrict violent video game sales to minors" source:  News.com