There was a case on that American Unsolved Mysteries TV show the other day when a young mother had been imprisoned for life, on medical evidence that she had poisoned her first baby, who died, and then made her second baby very ill. When the show was first aired several medical experts in America, including one from Yale, said it was a rare genetic disorder which most doctors find difficult to diagnose, and they know nothing about it.
Similarly, there are some blood disorders in children which can cause bruising marks, which can put their parents in legal difficulties. It's a question of weighing the medical evidence.
I still find it extraordinary that Judge Dupree was in charge of the Jeffrey MacDonald case Grand Jury in 1975, and his 1979 trial, and the 1985 and 1992 MacDonald appeals. That was hardly impartial. Dupree was hardly likely to admit to any irregularities, or to a wrong verdict. Dupree then passed the MacDonald case on his death, to his pal Judge Fox, who followed in Dupree's footsteps. I don't think that would have happened in the UK, or in Australia, or Canada, or New Zealand.