Law School

Criminal Procedure Part Four: The Exclusionary Rule and Constitutional Remedies

Jan 15, 2026
Dive into the fascinating world of the exclusionary rule, which protects against illegally obtained evidence in court. Discover its origins from cases like Mapp v. Ohio and the shift from judicial integrity to deterrence. Explore complex concepts like the fruit of the poisonous tree doctrine and the good faith exception, revealing how courts balance individual rights with societal safety. Learn about the nuances of Miranda rights, coerced confessions, and the implications of the harmless error doctrine. This engaging discussion illuminates key legal principles that shape criminal procedure.
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INSIGHT

Core Definition And Scope

  • The exclusionary rule bars evidence obtained in violation of constitutional rights from the prosecution's case in chief.
  • It also reaches derivative evidence under the fruit of the poisonous tree doctrine.
ANECDOTE

Mapp's Forced Entry Example

  • In Mapp v. Ohio, police forced entry into Ms. Mapp's home without a valid warrant and found illegal materials in a trunk.
  • The Supreme Court held that states must apply the exclusionary rule to give the Fourth Amendment real meaning.
INSIGHT

Rationale Shift To Deterrence

  • The exclusionary rule's rationale shifted from judicial integrity to deterrence in the 1970s.
  • That shift forces courts to weigh deterrence benefits against societal costs when deciding suppression.
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