Phil Dawdy, over at Furious Seasons, has this story running, just now, which is what alerted me to it. There was something on the Beeb, a couple of days ago; less detailed, but I think it was the same studies that were being discussed:
Bad Behaviour Does Not Doom Pupils, Studies Say
The first couple of bricks to fall out of the ADHD wall? Who knows, eh, who knows?