I read recently of people who've made arrangements to donate their body to medical schools being sent letters telling them that if they should die of Alzheimers, then their body will not be accepted. I'm guessing they are getting so many such donations that they need other causes of death bodies for the sudents.
For some period of years I had read that the schools get more offers of bodies than they can use. Don't know if that is currently true, but I bet it is up this year. Anyway, I think everyone needs to think about a back-up plan if they are hoping to donate to science.
My Mom has sent paper work to a historically Black med school near her, and this is something she has always wanted to do (along with eye donation), but we children understand that we may be making other arrangements if that falls through.