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This essay posits that Justice Sonia Sotomayor is the Supreme Court’s chief defender of the Fourth Amendment and the cherished values it protects. She has consistently defended Fourth Amendment freedoms—in majority, concurring, and especially in dissenting opinions. Part I recounts a few of her majority opinions in Fourth Amendment cases. Part II examines her concurring opinion in United States v. Jones. Part III examines several of her dissenting opinions in Fourth Amendment cases. A review of these opinions demonstrates what should be clear to any observer of the Supreme Court: Justice Sotomayor consistently defends Fourth Amendment principles and values.