It depends on the justification being used. There’s a separation between the people who make the law and the people who enforce it. A local police force can’t make violating immigration laws legal, but they can say, “We’re not dedicating any of our resources to investigating or enforcing those laws because we’ve got more important things to do.” And a local body that oversees the police force can say, “You will not used your resources on this” without violating any federal laws. Unless there is a law that specifically sets out requirements for local police in how they will assist and report into ICE.
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