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How You Start is How You Finish? The Slave Patrol and Jim Crow Origins of Policing
(www.americanbar.org)
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Clearly the article is not talking about the global history of policing, it's talking about American history of policing. You can infer that because Jim Crow laws are American laws. They didn't have Jim Crow in Sweden.
As for the history of American policing, again, the article acknowledges that American policing has 2 lineages that merged over time.
There's no one "origin" to American policing.