A close friend of mine found little 'packages' being left for her around her home, whenever her young daughter had a certain friend over for a play date. The little girl (aged about 7) would leave her calling card in the bathroom bin (like, why not flush it?); in the dirty clothes hamper in the laundry (she hadn't put any of her clothes there, just the lump of poo); in pot plants; behind cupboards; on the floor in various parts of the house.
My friend tried to talk to the little girl's mother, but the parents were in total denial and just couldn't take the info on board.
So my friend simply stopped having the girl over for play dates.
There's not much left of your school year. I suspect this teacher just snapped, had too much to cope with. I've seen some pretty major 'snaps' at the end of the school year, from staff and kids alike.
However, I do agree - this was going a bit too far. Fair enough, tell the parents that the boy left a package for her, but unless the teacher has been trying to get the message through to these parents all year and they're just not listening - I can't understand why she would send home "Exhibit A". Because really, it doens't prove anything. A parent in denial that it's THEIR child leaving packages, is not going to beleive that the evidence came from their child. How many other kids in that class?
It sounds to me like that teacher desperately needs counselling.
Marg