In Mapp v. Ohio (1961), what did the Supreme Court rule about illegally seized evidence?

• A. Illegally seized evidence cannot be used in state criminal trials.
• B. Illegally seized evidence can be used if it does not violate the Fourth Amendment.
• C. Illegally seized evidence can be used in state trials but not federal.
• D. Illegally seized evidence has no bearing on state trials.

Answer: (A)

The main idea is that the exclusionary rule applies to state prosecutions through the Fourteenth Amendment, so evidence obtained illegally cannot be used in state criminal trials. Mapp v. Ohio extended the protection to the states, holding that if police seize evidence in violation of the Fourth Amendment, that evidence is inadmissible in state courts. This keeps state trials to the same standard as federal trials and helps safeguard constitutional rights by preventing conviction based on unlawfully gathered evidence.

Why this is the best answer: it reflects the Court’s decision to apply the Fourth Amendment’s protections to the states, not just to federal cases. Illegally obtained evidence is excluded to deter police misconduct and to uphold due process in state courts as well.

Why the other ideas don’t fit: the rule isn’t about allowing such evidence if the Fourth Amendment isn’t violated—illegally seized evidence by definition violates the Fourth Amendment, so it would still be excluded. The decision does apply to state trials, not just federal ones, so it wouldn’t be admitted in state court. And the rule certainly has bearing on state trials, since the point of the case is to govern how evidence obtained illegally is treated in those trials.