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What we know now: the Evanston Illinois field lineups
1Department of Psychology, Augsburg College, 2211 Riverside Avenue, Minneapolis, MN 55454, USA. steblay@augsburg.edu
Law and Human Behavior
|February 24, 2010
Summary
Eyewitness identification procedures in Illinois showed differences between lineup types. Double-blind sequential lineups yielded more detailed eyewitness accounts compared to non-blind simultaneous lineups.
Area of Science:
- Forensic Psychology
- Criminal Justice
Background:
- The Illinois Pilot Program compared non-blind simultaneous and double-blind sequential eyewitness identification procedures.
- Eyewitness identification accuracy is critical in criminal investigations.
Purpose of the Study:
- To empirically evaluate methodological differences between non-blind simultaneous and double-blind sequential lineups.
- To analyze differences in eyewitness identification reports based on lineup procedures.
Main Methods:
- Analysis of 100 eyewitness identification reports obtained via Freedom of Information Act from Evanston, Illinois.
- Comparison of data from non-blind simultaneous and double-blind sequential lineup conditions.
Main Results:
- Pre-existing differences between lineup conditions were observed, including witness familiarity with the offender and time elapsed since the event.
- Verbatim eyewitness comments were recorded more frequently in double-blind sequential (83%) versus non-blind simultaneous (39%) reports.
- Effective lineup structure was utilized equally across both lineup conditions.
Conclusions:
- Methodological variations existed between the compared lineup procedures.
- Double-blind sequential lineups facilitated more comprehensive documentation of eyewitness accounts.
- Future research should consider these factors when evaluating eyewitness identification protocols.
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