gore was looking for sadomasochism and she found it. >> reporter: he supports this american academy ofiatrics finding. the received is now clear and convincing. media violence is one of the causal factors of real life violence and aggression. >> kids spend an incredible amount of time with the media, seven to 11 hours a day. they see increasingly violent media. we all acknowledge that the media have an impact. why in this country would we spend $250 billion a year on advertising if we didn't think advertising affected people. >> so whose research to believe? who to judge? the u.s. supreme court already has. in striking down california's attempt at a violent video game law, the court had this to say about studies linking games to violent behavior. these studies have been rejected by every court to consider them, and with good reason: they do not prove that violent video games cause minors to act aggressively. bonnie ross, a mother of two young children with her own concerns, also happens to run one of the most successful first person shooter games around -- "halo 4." while it's far more