The United States v. Royer case in 1924 revolved around the issue of whether or not a warrantless search and seizure conducted by law enforcement officers at an airport was constitutional under the Fourth Amendment. The defendant, Royer, had been stopped by two plainclothes detectives who suspected him of carrying narcotics based on his behavior and appearance. After being taken to a small room without his consent and having his luggage searched without a warrant, marijuana was found in one of his suitcases. In court, Royer argued that this evidence should be suppressed as it was obtained through an illegal search and seizure. The Supreme Court ruled in favor of Royer stating that while police have the right to approach individuals for questioning based on reasonable suspicion alone (a standard less than probable cause), they cannot detain them beyond what is necessary for brief questioning unless there's clear evidence justifying arrest or further detention. The court held that moving Royer to another location constituted an unlawful arrest since it exceeded the limits of investigative stop permitted under Terry v Ohio precedent; hence making subsequent searches unconstitutional too.

I'm sorry, but there seems to be a mistake in your request. The United States v. Royer case was decided by the Supreme Court in 1983, not 1924. In this case, Justice Brennan delivered a dissenting opinion arguing that the majority's decision significantly eroded Fourth Amendment protections against unreasonable searches and seizures. He contended that law enforcement officers had effectively seized Mr. Royer without probable cause when they took his airline ticket and identification and moved him to a small room for questioning about his luggage contents - all of which occurred before any drugs were found on him or he gave consent to search his bags. According to Justice Brennan, such actions amounted to an arrest rather than an investigatory stop as claimed by the majority; hence it should have required probable cause instead of reasonable suspicion only.