Which case extended the exclusionary rule to the state level?

Which case extended the exclusionary rule to the state level?

• A. Reaffirmed the rule only for federal cases
• B. Created the exclusionary rule
• C. Extended the exclusionary rule to the state level
• D. Applied to electronic surveillance only

Answer: (C)

The key idea is how the exclusionary rule becomes binding in state courts. The rule, which bars evidence obtained in violation of the Fourth Amendment, originated for federal cases (Weeks v. United States). States weren’t required to follow it at first, a point clarified by Wolf v. Colorado, which allowed states to opt out. The case that actually extended the rule to the state level is Mapp v. Ohio, which held that the Fourth Amendment protections apply to the states through the Due Process Clause of the Fourteenth Amendment, making illegally obtained evidence inadmissible in state prosecutions. This is why it’s the correct choice—the ruling directly incorporated the exclusionary rule for state courts. The other statements refer to the federal origin or narrower applications that do not reflect this state-level extension.

The key idea is how the exclusionary rule becomes binding in state courts. The rule, which bars evidence obtained in violation of the Fourth Amendment, originated for federal cases (Weeks v. United States). States weren’t required to follow it at first, a point clarified by Wolf v. Colorado, which allowed states to opt out. The case that actually extended the rule to the state level is Mapp v. Ohio, which held that the Fourth Amendment protections apply to the states through the Due Process Clause of the Fourteenth Amendment, making illegally obtained evidence inadmissible in state prosecutions. This is why it’s the correct choice—the ruling directly incorporated the exclusionary rule for state courts. The other statements refer to the federal origin or narrower applications that do not reflect this state-level extension.