John and Laura Arnold Foundation

IN JULY, SAN Francisco Superior Court Judge Sharon Reardon considered whether to hold Lamonte Mims, a 19-year-old accused of violating his probation, in jail. One piece of evidence before her: the output of algorithms known as PSA that scored the risk that Mims, who had previously been convicted of burglary, would commit a violent crime or skip court. Based on that result, another algorithm recommended that Mims could safely be released, and Reardon let him go. Five days later, police say, he robbed and murdered a 71-year old man...

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