Thanks fish and bingo.
I think some people here get too caught up in taking the other side of anything deemed somewhat controversial that points to the killer.Regardless of the evidence.
Abby, you questioned how easy it would be for hoaxers to obtain a human kidney. My response is that they needn't have to, because of the anatomical similarities between a human & pig kidney and the limitations in medical science at the time. Yes, the examining doctors opined that the half-kidney belonged to a human, but they could not know that for a fact, let alone identify its owner's gender.
Either way, it doesn't prove anything about the authenticity of the 'From Hell' letter.