Nothing wrong if there was paperwork with consent. I mean if you take a field trip to a mortuary, you're already bound to see bad things. Not like going to Disney. Go to a cemetery and happen to pass the tombstone of a student that died months earlier wouldn't be too unlikely if you had signed paperwork to bury the student there. If they illegally were keeping it without having any fine print consent, and were using it to have a artistic display piece on their shevling, then shame on them and they should probably slap their wrists (nothing to do with the field trip of course). Now if the motuary's INTENT was that they were going to keep the brain and display it when the school was having a future field trip in two months and put it out with a label so they could shock the students, then they could lose some money. That wouldn't be a good joke, as long as it was their intent and not coincidence.
Almost 6 years later and the family still has to go through the legal stuff regarding this. Kind of sucks, if you ask me, though I imagine some might say that their lawsuit is what's keeping this going.