by Stan B Walters
This article was originally published in 2007. While the context reflects the time of writing, the principles remain relevant to modern investigative interviewing and contributed to the development of the Cognitive Reliability Framework™.
Why Misdiagnosis, Preconception, and Outdated Assumptions Destroy Interviews
Every interrogation failure is not caused by a deceptive subject.
Sometimes the failure begins with the interviewer.
Too often, investigators enter the room carrying:
* assumptions,
* preconceptions,
* confirmation bias,
* and outdated beliefs about deception.
Once that happens, the interview becomes less about discovering the truth…
and more about proving the interviewer right.
That is where interrogation failure begins.
The “Pre-Conception Assassin”
One of the fastest ways to sabotage an interview is to decide—before the conversation even starts—who is lying and who is telling the truth.
If you enter the room believing the subject is deceptive, you begin filtering information through that assumption.
If you believe the person is truthful, you may overlook important inconsistencies or reliability problems.
Either way, the interview becomes distorted by bias instead of guided by evidence.
Preconception doesn’t simply influence the interview.
It quietly controls it.
Misdiagnosis Creates Failure
For decades, investigators were taught to rely heavily on behavioral “lie signs”:
* lack of eye contact,
* posture shifts,
* fidgeting,
* sweating,
* speech hesitations,
* crossed arms,
* and other stress reactions.
The problem?
Stress is not deception.
And behavior alone is often diagnostically shallow.
Anxiety, fear, trauma, anger, confusion, cognitive overload, cultural differences, or the pressure of the interview itself can produce behaviors investigators mistakenly interpret as deception.
When interviewers misdiagnose stress as deception, they often:
* narrow their focus,
* increase pressure,
* ask poorer questions,
* ignore valuable information,
* and unintentionally contaminate the interview.
The result is not better truth detection.
The result is interrogation failure.
The Interviewer Changes the Outcome
Research has consistently shown that interviewer tactics, tone, and structure directly affect interview outcomes.
An overly accusatory approach often:
* reduces cooperation,
* decreases information,
* increases resistance,
* and weakens statement reliability.
In contrast, narrative-based interviewing consistently produces richer and more reliable information because it allows memory retrieval to occur with less interruption and less contamination.
The interviewer’s choices matter.
In many cases, they determine the outcome.
Success Is Not Measured by Confessions
One of the biggest mistakes in interrogation culture is measuring success by confession alone.
A confession is not automatically proof of reliability.
And the absence of a confession is not automatically failure.
A better measure of success is this:
How much reliable, truthful, verifiable information did the interview uncover?
That shift changes everything.
It moves the interview away from manipulation and toward reliability.
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Away from assumption and toward diagnosis.
Away from outdated myths and toward evidence-based interviewing.
Final Thought
Most interrogation failures do not begin with bad intent.
They begin with outdated assumptions.
The interviewer who learns to recognize bias, reduce contamination, and diagnose reliability more accurately dramatically improves the chances of uncovering truthful information.
Because in the end…
The outcome of any interview is the sum of the interviewer’s choices.
© 2007 by Stan B. Walters