"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
This is fascinating, both because of the poor and dispossessed using language to exclude their oppressors AND said oppressors having difficulty while greasing the legal means of repression.
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