In Ed Kemper’s 1980 parole hearing, we learn that he suffers from an allergy to metals: “I have a medical order for a medical bed, for the extra length. I have an allergy to metals that’s been determined since last May to be an allergy to free nickel, which is a catalyst which, I understand, is used in a lot of alloys — almost all of the alloys in prison. In other, words, I’m allergic to being in prison, to slip it down to a very simple statement – handcuffs included.”

Source: Ed Kemper’s April 30,1980 parole hearing / Photo from the book Murder Capital of the World by Emerson Murray, 2021