During Wednesday's George Zimmerman trial the defense called witness Dennis Root, a former police officer and use of force expert. He testified that people who've been involved in high stress events, like shootings, can have trouble remembering things.
The trauma can cause 'hysterical amnesia', which is when defendants claim they don't remember committing a crime. This could explain the various inconsistencies in Zimmerman's descriptions about what happened the night he shot Trayvon Martin.
Randi Kaye reports.
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