"Barnard says that one of the most striking patterns in his research is the degree to which criminal justice officials could not understand any of what they were told by defendants." https://www.atlasobscura.com/articles/thieves-cant-in-convict-era-australia
(I'm not academically qualified to draw parallels to modern slang and "secret tongues" used by today's dispossessed, but it's fascinating to think about.)
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