Criminal Procedure
393 U.S. 410 (1969)
Study notes for Spinelli v. United States: professor notes, cold call prep, exam angles, and memory aids.
An affidavit based solely on an informant's tip must demonstrate the informant's reliability and provide the basis of their knowledge to satisfy probable cause under the Fourth Amendment.
In Spinelli v. United States, the Supreme Court grappled with the requirements for establishing probable cause based on informant testimony. The Court underscored the necessity for law enforcement to provide a two-prong showing: the informant's credibility and the basis of the informant's knowledge. In this case, the FBI's reliance solely on a confidential informant’s claims, without sufficient corroboration or context regarding the informant’s reliability, rendered the warrant unconstitutional. This ruling reaffirms the protections of the Fourth Amendment against unreasonable searches and highlights the importance of substantive evidentiary foundations in search warrants.
The decision also reflects the continuing development of jurisprudence surrounding the use of informants in criminal investigations. The need to cultivate a robust framework for assessing the credibility of informants and the factual basis for their claims is paramount for maintaining the integrity of law enforcement practices. Professors often emphasize the implications of this case on future cases involving informant tips and the evolving standards for probable cause determinations.
Informants Need Reliability and Basis (INRAB) for credibility.
| Case | Distinction |
|---|---|
| Aguilar v. Texas | Aguilar established the two-prong test required for informant testimony, while Spinelli clarified the necessity of meeting these prongs in practice. |
| Illinois v. Gates | Illinois v. Gates adopted a totality-of-the-circumstances test for determining probable cause, which contrasts with Spinelli's strict adherence to the two-prong test. |
Maintaining a high standard for probable cause protects individuals' rights against unreasonable searches and upholds the integrity of law enforcement.
Strict requirements may hinder police investigations by making it more difficult to utilize informant information, potentially allowing criminal activity to go unchecked.
Spinelli v. United States often appears on exams in discussions about probable cause and the use of informant testimony. Students may be asked to analyze an affidavit or evaluate if it meets the two-prong test established in preceding cases.