Each of the three approaches to proving a correlation between violent video games and criminal behaviour has its flaws. Studies that look for correlations between exposure to violent video games and real-world aggression can never prove that the games cause physical aggression1. Randomized tests, which assign subjects to play violent or nonviolent games and then compare levels of aggression, depend on lab-based measures of aggression that are difficult to compare with real-life aggression. Finally, longitudinal tests, which assess behaviour over time within a group, are a middle ground between the other two but similarly cannot prove it was the video games specifically that leads to increased aggression. In contrast to the claim that the effects of violent video games are worse than those of TV, a Potter study in 1999 found that 'children are more likely to be affected and more likely to imitate aggressive acts if the violence is depicted more realistically.'2  1 Schaffer, A. (2007, April 27). Don't Shoot. Retrieved June 2, 2011, from Slate:  2 Gentile, D. A., &amp; Anderson, C. A. (2003, October 16). Violent Video Games: The Newest Media Violence Hazard. Retrieved June 2, 2011, from