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A Los Angeles police union is thrilled about the Supreme Court decision earlier this week that gives cops new authority to conduct searches, but civil libertarians are wary that the decision could ultimately weaken people’s Fourth Amendment rights.

In Fernandez v. California, a 6-3 majority ruled that the police may search a residence as long as they have the permission of at least one resident. The ruling clarified some confusion over whether the Fourth Amendment requires police to get the consent of all residents. In practice, police will no longer need to obtain search warrants if they can persuade a single resident to let them in.