Hugo Black

“ The earlier events certainly disclosed ample grounds to justify the following of the car, the subsequent stopping thereof, and the questioning of petitioner by the agents. This interrogation, together with the sighting of the cartons and the labels, gave the agents indisputable probable cause for the search and arrest.
When an investigation proceeds to the point where an agent has reasonable grounds to believe that an offense is being committed in his presence, he is obligated to proceed to make such searches, seizures, and arrests as the circumstances require. ”

“ It is only by such alertness that crime is discovered, interrupted, prevented, and punished. We should not place additional burdens on law enforcement agencies.
I would affirm the judgments on the rationale of Brinegar v. ”