So you have some grant money, but doing real research is super hard. Instead you blow all the money on hookers and cocaine, then use unpaid interns and hand out surveys to high school students instead of really looking into anything. Those that fill it out, I guess you make the interns look into their school records—or if you are super lazy just take them at their word. Congratulations, you have not finished every study that has ever been done about violent games impacting behavior of minors!
The newest study, though, did manage to take the extra step and look into the broader reach of gaming itself; finding that the behavior problems, lower grades, and poor social skills all seemed to revolve around people who could/would not stop playing any video game. The study states that it is unsure if the researched gravitate towards the games or if the gaming causes it. Here is an idea, if you lack the self-control to hang out with friends, do your homework, study for a test, or desire to be in school, you might have some kind of issues to begin with.
Source: Physicians News