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Fourth Amendment Legal Guides

5 guides covering Fourth Amendment topics, each with CaseDiver search beside the article.

• Carpenter and Cell-Site Location Information Privacy

  Carpenter v. United States held that obtaining historical cell-site location information generally requires a warrant. This guide explains the ruling, the third-party doctrine tension, and how location privacy continues to evolve.

• Digital Surveillance After Kyllo, Jardines, and Carpenter

  From thermal imaging and porch dog sniffs to CSLI and geofence warrants, modern surveillance tests Fourth Amendment limits. This guide connects Kyllo, Jardines, Carpenter, and recent geofence litigation.

• Emergency Aid, Brigham City, Fisher, and Caniglia

  Brigham City and Michigan v. Fisher define the emergency-aid exception; Caniglia rejects a freestanding community-caretaking entry into the home. This guide maps those Fourth Amendment lines.

• Riley and Cell Phone Searches Incident to Arrest

  Riley v. California generally requires a warrant before officers search digital data on a cell phone seized incident to arrest. Learn how Riley reshaped search-incident doctrine for modern devices.

• Seizures, Torres v. Madrid, and Hot Pursuit After Lange

  Torres clarifies when force is a seizure; Lange limits categorical hot pursuit into the home for misdemeanors. This guide explains those Fourth Amendment seizure and entry rules.