I wonder what ages the kids are he teaches? For high school biology students, the chance to dissect a real placenta would be an amazing lesson, but this is something he should be asking a local hospital about through appropriate channels to allow them to get a willing donor.

As for eating his kids' placentas, what a strange thing to do. You think if he and his partner were so ok with eating it (which many couples are) they would save it for the mother who is most in need of it's blood and nutrition.