Final answer:
The Supreme Court case Terry v. Ohio set the standard for allowing police to rely on anonymous tips to establish reasonable suspicion, a precedent that is fundamental in law enforcement procedures related to stop and frisk.
Step-by-step explanation:
The Supreme Court decision in Terry v. Ohio, 392 U.S. 1 (1968) established the standard for allowing police to rely upon anonymous information to warrant reasonable suspicion. This ruling allows police officers to stop an individual if they have reasonable suspicion that the person has committed or is about to commit a crime, and they may frisk the suspect for weapons if there is a reasonable suspicion that the suspect is armed and dangerous without violating the Fourth Amendment. This precedent set the stage for a more flexible understanding of reasonable suspicion and how it can be based upon less concrete evidence such as anonymous tips.