Thanks Fido, I remember that was what Molly alleged to have happened, I'm just trying to think of ways that SM could be involved in such a way that they can't prove it enough to charge her. Class project on a brick that was kept on the bedside locker always seemed a stretch to me...I guess I'm more thinking out loud at this point sorry!
I always thought the paving stone as a class project was an excuse for having it in the bedroom was a bit weak, just like TM alleging he bought a baseball bat for Jack and didn't get round to giving it to him, so it was conveniently beside TMs bed in the basement. Both stories IMO appear concoted to explain why the 2 weapons were where they say they were, and happened to be 'close at hand'. However, wouldn't both of these stories be relatively easy to verify/ refute? I mean purchase of the bat must have involved sales receipts; the kids teachers can confirm if there were projects involving concrete paving stones. Surely detectives would have checked these things out, wouldn't they?