The Cognitive Interview - Fisher

Question 1

Aim of Fisher

Answer 1

To test the cognitive interview in the field

Question 2

Method of Fisher

Answer 2

Field Experiment with actual interviews of real interviews by serving police detectives

Question 3

Participants of Fisher

Answer 3

16 detectives - Robbery Division of Dade County, Florida

Minimum five years

Question 4

Procedure of Fisher

Answer 4

First Phase - Selection detectives interviews recorded using standard techniques, took 4 months, 88 interviews

Detectives in two groups - 1 group trained in cognitive interview

Training - 4 60minute sessions. 7 detectives completed

Next 7 moths more interviews done. CI’s were analysed by a team at the uni of Cali, blind to conditions

Question 5

Results of Fisher

Answer 5

CI group - 47% more info than before
- 63% more info than untrained group

Accuracy, lab based research - no difference between C1 and standard interview. 85% of statements being correct in all conditions

24 with corroboration, 94% of statements were corroborated

Time taken to interview witness is not significantly different