Why Trial by Ordeal was like a medieval polygraph

Unless they didn’t like you, probably.

Also, it kinds of assumes that the accused is a true believer in iudicium Dei. Was that actually a common belief, or just the pretense of it?

There is a similar story about Napier, the discoverer of logarithms:

Another problem that needed solving was the suspicion that there was a thief among Napier’s new workers. Tools and supplies had been disappearing but when kitchen tools vanished, Napier decided to take action. After all the workers had denied any wrong doing, Napier gathered the workers and told them he was going to use his truth telling rooster. Each worker was to go in the dark storage room where the rooster was perched, pet it, and then come out. After each worker had done this, Napier asked to see the palms of their hands. Everyone but one worker had black palms. He knew then, the thief was the one with clean palms. Because the guilty worker didn’t touch the rooster for fear the rooster would know he was the thief, he kept his hands in his pockets. But what the worker didn’t know is Napier had covered the rooster with lamp black. Those who had nothing to hide petted the rooster, thus their hands turned black. But the guilty one, who did not touch the rooster, came out with clean hands. Unorthodox, yes, but very ingenious.

from http://www.math.wichita.edu/history/men/napier.html

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