G543 - Interviewing Witnesses - Fisher And Geiselmann Flashcards
What type of experiment was used? With what?
Field experiment with actual interviews of real witnesses by police detectives from the Sade county police dept in Miami
How many detectives were studied? From where? Matched on what?
16 detectives from the dade county robbery division. All were experienced with a minimum of 5 years with the division
What did researchers do first?
Recorded the detectives carrying out their standard interviews for 4 months (88 interviews).
What did researchers do after recording the detectives for the first time?
They split the detectives into two groups
What were the two experimental groups?
One group was trained in cognitive interview (CI) techniques and the other group carried on as normal
How many sessions did the CI training consist of?
4 60 minute sessions
How many detectives completed the CI training?
7
What happened over the 7 months after the two groups were split?
More interviews were recorded for both groups
Who were recordings analysed by?
A team at the university of California who were blind to the conditions
What % more information did the CI trained detectives help witnesses recall after training?
47%
How much more information than untrained detectives did the CI trained detectives help witnesses recall?
63%
How were interviews tested for accuracy?
By checking them against other witnesses
How many cases were there with corroborating evidence?
24
What % of the recalled information was corroborated?
94%
What did they aim to test?
To test the cognitive interview in the field
