An expert for the defense can serve multiple functions:

• Analyze and interpret the prosecution's laboratory report and data.
• Identify possible errors or omissions committed by the prosecution's testing laboratory or in evidence handling prior to the laboratory testing.
• Observe analysis when appropriate (e.g. limited sample cases).
• Evaluate the need for or conduct independent tests on the biological material.
• Offer testimony at trial to address the accuracy or significance of the DNA evidence.

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