In the 1968 Supreme Court case, Rodriquez v. United States, the issue at hand was whether evidence obtained by a warrantless search could be used in court if it had been seized after an arrest for a minor traffic violation. The defendant, Rodriquez, had been pulled over for speeding and subsequently arrested when officers found heroin in his car during their investigation of the scene. He argued that this violated his Fourth Amendment rights against unreasonable searches and seizures since there was no probable cause to suspect him of drug possession based on a simple traffic violation. The Supreme Court ruled in favor of Rodriquez stating that without specific reason to believe he was involved in criminal activity beyond the initial traffic offense, searching his vehicle without obtaining a warrant first constituted an illegal search under the Fourth Amendment. Therefore, any evidence gathered from such unlawful intrusion is deemed "fruit of poisonous tree" and cannot be admitted into court proceedings as per exclusionary rule doctrine.

In the dissenting opinion for Rodriguez v. United States, Justice Thomas argued that the majority's decision expanded Fourth Amendment protections beyond their historical boundaries. He contended that the Court’s ruling was based on an incorrect interpretation of precedent and a misunderstanding of common law principles related to unlawful detention. According to him, there is no legal basis for distinguishing between traffic stops and other forms of encounters between police officers and citizens in terms of duration or investigative techniques used during such interactions. Furthermore, he asserted that by focusing on what constitutes a reasonable seizure under the Fourth Amendment instead of whether there was probable cause for extending it, the majority had unnecessarily complicated matters with its new test about unrelated investigations prolonging detentions without independent justification.