In the 1969 case Santana v. Texas, the U.S Supreme Court was asked to consider whether a search and seizure conducted without a warrant violated the Fourth Amendment rights of defendant Jose Santana. The police had received an anonymous tip that Mr. Santana was in possession of illegal drugs at his home and proceeded to conduct a search without obtaining a warrant first, during which they found heroin on his person. In court, Mr. Santana argued that this evidence should be suppressed as it was obtained illegally due to lack of proper warrants. The Supreme Court ruled against him by upholding the legality of such searches under certain circumstances known as "exigent circumstances". This doctrine allows for exceptions where law enforcement can act immediately due to pressing conditions like imminent danger or risk of evidence being destroyed if not acted upon promptly. In this case, it was determined that there were exigent circumstances present - namely, immediate action needed because contraband could have been quickly disposed off before any warrant could be secured from courts given its nature (drugs). Therefore, despite no prior warrants issued for searching Mr.Santana's premises or person; their actions were deemed constitutional.

The dissenting opinion in the Santana v. Texas case argued that the majority's decision to allow warrantless arrests at a suspect's home, based on exigent circumstances and hot pursuit, was an overreach of police powers. The dissenters believed this ruling violated Fourth Amendment protections against unreasonable searches and seizures. They contended that there were no immediate dangers or risks present to justify bypassing the requirement for a warrant. Furthermore, they disagreed with categorizing this situation as "hot pursuit," arguing it should only apply when an ongoing emergency is evident or if delay would risk destruction of evidence or escape of a dangerous suspect - conditions not met in this case according to them.