Marquette Law Review Volume 68 Article 5 Issue 2 Winter 1985 Finding Probable Cause in an Informants's Tip Peter F. Mullaney Follow this and additional works at: http://scholarship.law.marquette.edu/mulr Part of the Law Commons Repository Citation Peter F. Mullaney, Finding Probable Cause in an Informants's Tip, 68 Marq. L. Rev. 314 (1985). Available at: http://scholarship.law.marquette.edu/mulr/vol68/iss2/5 This Article is brought to you for free and open access by the Journals at Marquette Law Scholarly Commons. It has been accepted for inclusion in Marquette Law Review by an authorized administrator of Marquette Law Scholarly Commons. For more information, please contact
[email protected]. FINDING PROBABLE CAUSE IN AN INFORMANT'S TIP INTRODUCTION Effective law enforcement in America relies to a significant extent upon information supplied by informants. Studies con- ducted in the 1970s indicated that more than half of the search warrants issued relied, at least partially, on hearsay tes- timony of unnamed informants.' The majority of those war- rants produced evidence of criminal conduct.2 At present, police routinely receive information from a variety of individ- uals, among them turncoat criminals, paid police informers, interested citizens,3 and some who prefer anonymity. Police reliance on this kind of information presents the American ju- dicial system with a formidable challenge: to define, consis- tent with the fourth amendment,4 a standard that proves the reliability of informant tips. 1. See Rebell, The Undisclosed Informant and the Fourth Amendment: A Search for Meaningful Standards, 81 YALE L.J.