It’s an odd story.
If the kid comes home like that, what are the parents going to say about the school letting the kid sit there like that?
On the other hand, I think I could tell who it was pretty easily with my nose.
“If the kid comes home like that, what are the parents going to say about the school letting the kid sit there like that?”
Why should the parents assume the teacher “let” the child that had the problem “sit there” as you say?
Even “special-ed” kids have enough training, from home even, to go to the bathroom and to know when they need to go to the bathroom.
So, instead of blaming the teacher, why wouldn’t the parents ask their child: “Why didn’t you tell the teacher you had to go to the bathroom?”