This issue has been addressed over and over again elsewhere as well as similiar attempts agains other forms of entertainment.
The bill in question is SB 249, introduced in the Michigan Senate by Hansen Clarke (et al) and referred to the Judiciary Committee for action. The State Senate is out on Easter break right now, but will be back soon.
It is a shame as parents will buy what their kids want any way.
Why do some states and people want to legislate a parent's duty as a parent?
Is Europe having these same over 18 issues with computer games? I won't even get started on how the ESRB is a private rating system and shouldn't be condoned by a Public foundation such as the Senate or how the ESRB is costly to get a game rated.