Johnson v. United States

Acting on a tip and the strong, unmistakable smell of burning opium, narcotics officers traced the odor to a hotel room and, after Johnson (defendant) let them in upon learning who was knocking, told her she was under arrest because they intended to search the room — without her consent and without a warrant. The search turned up opium and a still-warm smoking apparatus, and the district court refused to suppress this evidence, leading to Johnson's conviction for violating federal narcotics laws, which the court of appeals affirmed.