No. Kids that go on ritalin are actually a lot calmer once they start taking the medication. Sure I guess one can have a violent adverse effect, but it's a very rare side effect that usually is associated with overdosing. The only school shooters that were had taken ritalin were in Wisconsin and Oregon and those boys had actually gone OFF the medication months before they murdered.
The NRA is becoming such a joke when it comes to finding any other excuse to violence that even some Fox News hosts can't take them seriously. And Oliver North? Really? I think that man has connections to violence and terrorism on his own hands. Oh wait...they aren't terrorists; they're freedom fighters that Ollie should be illegally funneling weapons and money too.