The U.S. Supreme Court on Tuesday is hearing a case about violent video games and their potential impact on young people.

Sound familiar? This debate has been raging in the United States for more than a decade.

So what issues are at stake in this case? What evidence is there to support the argument that shoot-'em-up video games encourage kids to be violent or become desensitized to violence?

And what's the trend with labeling violent games -- and does it work?