A federal judge struck down a Tennessee law Tuesday that would have required businesses in the state to post warning notices on their public restrooms if they have policies allowing transgender patrons to use the facilities that match their gender identities. The American Civil Liberties Union challenged the law in June on behalf of two business owners — the owner of Sanctuary, a performing arts and community center in Chattanooga, and the owner of Fido, a restaurant in Nashville, among other businesses. The law went into effect on July 1, but U.S. District Judge Aleta A. Trauger issued a preliminary injunction against it a week later. Then on Tuesday, Trauger permanently blocked the law by granting the ACLU’s motion for summary judgment, which asks a court to decide a case without a full trial.