California is considering another step to protect its interests — specifically, its weed — from Washington meddling.

The proposal — the first of its kind in the nation — would prevent state and local police from helping federal agents crack down on marijuana activity that California has deemed to be legal. Despite objections from law enforcement, it cleared the Assembly Public Safety Committee Tuesday by a 5-2 vote.

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The bill is largely symbolic, said Stanford Law Professor Rob MacCoun, an expert on drug policy, as “it doesn’t prevent federal crackdowns, but it signals that they will be both legally and politically costly for the feds.”