When I was in HS, back in the early 90s, our biology class took a field trip to the college our teacher had attended. The purpose of our trip was to look at a human cadaver. The instructor showed us the body of a deceased older man, showed us how the muscles were atrophied from age, and joked that he wished they'd send him a cadaver from a 16-yo cheerleader. Then he pulled out jars from his collection-- organs that had some interest to him. The smallest heart (from a 90-lb Asian woman), the largest heart (from an obese smoker), etc. He told us he was required to send every part back (to whom?) but hinted that he had ways around it. I was thoroughly disgusted, but I assumed that people who work around this all the time must get sort of callous about it. That's no excuse, but this type of thing may be more common than we think.