IMPEDIMENTS
AND
CHALLENGES
TO TRUTH
DETECTION
Motivation to Lie, Omit, Exaggerate, Avoid
We don’t know the parties or witnesses
We don’t see or hear from the parties or witnesses for long
Most things are irrelevant
Limited time: busy calendar
Planned/prepped testimony; not spontaneous
We can’t interact with parties/witnesses
Leading questions
Courtroom/hearing set up
Rules of Evidence
Witnesses are not supposed to have narrative answers
Lack of corroborative information/materials
Important witnesses or evidence may not be presented or
admittable
We don’t know witnesses or parties psychological issues /
background / personality disorders