At schools throughout the county, the police posted an employee known as a resource officer, whose job was to provide support to administrators. But they also helped to identify gang members. What constituted membership was nebulous. ICE identified someone as a gang member if he met at least two criteria from a list that included “having gang tattoos,” “frequenting an area notorious for gangs,” and “wearing gang apparel.” Sandoval had observed how Carlos and his friends from MS-13 would change their style of dress in response to the heightened police activity. In the weeks after the murders of
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