Final answer:
Elkins v. United States overruled Wolf v. Colorado, establishing that evidence obtained by federal officers in violation of the Fourth Amendment is inadmissible in federal courts and applicable to the states as well.
Step-by-step explanation:
The decision in Elkins v. United States did explicitly overrule the decision in Wolf v. Colorado. The Wolf case determined that evidence obtained illegally by state officers could be used in court because the federal exclusionary rule did not apply to state courts. In contrast, Elkins v. United States recognized that evidence obtained by federal officers in violation of the constitutional guarantee against unlawful searches and seizures is inadmissible in federal courts. Consequently, this overruling established that the exclusionary rule is also applicable to the states through the Fourteenth Amendment. This landmark decision enhanced the protection of individual rights against unlawful police searches.