Police accuracy in truth/lie detection when judging baseline interviews.

Area of Science:

• Psychology
• Forensic Science
• Law Enforcement

Background:

• The comparable truth baseline (CTB) approach is known to improve deception detection accuracy in laypeople.
• Previous research has primarily focused on the effectiveness of CTB in non-professional groups.
• The efficacy of CTB in enhancing accuracy among law enforcement personnel remains less explored.

Purpose of the Study:

• To investigate whether the CTB approach enhances deception detection accuracy specifically for law enforcement personnel.
• To compare the accuracy rates of police officers using CTB versus traditional questioning methods.
• To analyze the underlying mechanisms, such as response bias, contributing to deception detection accuracy.

Main Methods:

• Ninety-five police officers evaluated 10 mock undercover mission interviews.
• Interviews were divided into two conditions: standard questioning and CTB questioning.
• Participants judged the veracity of statements, with half the interviewees lying and half telling the truth.

Main Results:

• While overall and truth accuracy did not differ between conditions, lie detection accuracy was significantly higher in the CTB group.
• Signal detection analyses indicated that the CTB condition led to a decrease in response bias.
• This suggests CTB helps officers make more accurate judgments about deception.

Conclusions:

• The CTB approach positively impacts law enforcement personnel's ability to detect deception.
• Reduced response bias is a key factor in the improved accuracy observed with CTB.
• Implementing CTB questioning may be a valuable strategy for enhancing investigative interviewing techniques in law enforcement.