Which case provides the foundational principles for probable cause and related warrants and searches, including the famous automobile exception?

• A. Graham v. Connor
• B. Aguilar v. Texas
• C. McAnnis v. State
• D. Brinegar v. United States

Answer: (C)

Probable cause sets the standard for when police may search or seize, grounding the warrant requirement in a practical, non-technical belief that evidence of a crime is present. Brinegar v. United States clarifies that this standard rests on a reasonable basis for belief, not mere suspicion, and that warrants are generally required for searches and arrests unless a recognized exception applies. This case frames how prosecutors and officers justify intrusive actions: there must be a credible basis to believe contraband or criminal activity is involved.

The famous automobile exception is a notable exception to the general rule, recognizing that vehicles’ mobility creates a special need to act on probable cause without a warrant in certain circumstances. That doctrine originates from Carroll v. United States, which established that a car can be searched without a warrant when probable cause exists due to its movable nature. While Aguilar v. Texas contributed to older formulations of probable cause and Graham v. Connor addresses use of force, Brinegar provides the foundational foundation for probabilistic justification and the warrant framework in this context.