A defendant may waive their right to counsel during a police interrogation even if the interrogation begins after the defendant's assertion of their right to counsel at an arraignment or similar proceeding. Decided May 26, 2009 (argued January 13, 2009). Opinion of the Court: Antonin Scalia → go there Dissenting: Stevens, Breyer. Applied: the Sixth Amendment → go there Topic: Right to counsel. Montejo v. Louisiana, 556 U.S. 778 (2009), is a 5–4 decision by the United States Supreme Court that overruled the Court's decision in Michigan v. Jackson. The case concerned the validity of a defendant's waiver of his right to counsel during a police interrogation. In reversing Jackson, the Court said such a waiver was valid. Wiki link