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In page 2014 California Proposition 47:

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However, a 2018 study from the University of California, Irvine, maintains that Prop 47 was not a “driver” for recent upticks in crime, based upon comparison of data from New York, Nevada, Michigan and New Jersey (states that closely matched California’s crime trends) 1970 to 2015, but that "what the measure did do was cause less harm and suffering to those charged with crime."[14]