The human tissue industry has created medical advances for millions of Americans. Tissue taken from cadavers is turned into medical products for the living. A tendon can be used to repair a torn ACL. Veins are used in heart bypass operations. Bone can be turned into plates and screws. They look like something you'd find in a hardware store, but these get used to mend a broken leg. It's a $1 billion-a-year industry that attracts the altruistic, but sometimes the greedy.