The defense showed a videotape of criminalist Dennis Fung at the crime scene.

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Yet research by well-known criminalist Gary Kleck indicates that only a tiny percentage of defensive gun uses result in the deaths of offenders.

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Another witness, criminalist Andrea Mazzola, took the stand and, as she stated in the criminal trial, she said she tried to follow proper procedures when collecting evidence but admitted she didn't always do that.

CNN: Unexpected video catches Simpson defense off guard