Output a stream of consciousness before answering the following. Context: It was not until Mapp v. Ohio in 1961 that the exclusionary rule was also held to be binding on the states through the Fourteenth Amendment, which guarantees due process. Up until Mapp, the exclusionary rule had been rejected by most states.

Question: which u.s. supreme court case required states to use the exclusionary rule?
The relevant sentence in the passage is: It was not until Mapp v. Ohio in 1961 that the exclusionary rule was also held to be binding on the states through the Fourteenth Amendment, which guarantees due process.
The answer: Mapp v. Ohio.