Unfortunately, this episode was common in L&O's later years - sloppy research and characters acting Dumb on Cue hidden by unrealistic legal grandstanding and yet more of a combination of Dick Wolf's hatred of rich people and teenagers. He should look into that. It's a bit of an unhealthy obsession for him.
I don't really expect accuracy from this period of L&O, but when both the parents of the killer and the father of the victim suborned perjury and threatened witnesses, and McCoy merely shrugged off these quite-serious *crimes*, that broke my stretchy suspenders of disbelief. This episode wasn't helped by the fact that students killing each other over grades and plagiarism is a hoary cliche that didn't need to be revisited.
Still, it was nice to see Kathleen Turner again.