Dollree Mapp's conviction was overturned due to an illegal search of her home in the 1961 Supreme Court case Mapp v. Ohio.
After her case went to the Supreme Court in Mapp v. Ohio in 1961, Dollree Mapp's conviction was overturned because the search of her home had been done illegally. The Court established the exclusionary rule, stating that evidence obtained through an illegal search in violation of the Fourth Amendment is inadmissible in a state court, regardless of its relevance to the case.
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