Search Results Use the search box below to revise your search, or start a new search. Studies (1) Variables Publications Your query returned 1 studies. Series results are grouped under the most relevant study. Ungroup series results to view all 1 results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Supporting Police Integrity in the Philadelphia [Pennsylvania] Police Department, 1991-1998 and 2000 (ICPSR 3977) Greene, Jack R.; Piquero, Alex R.