|P.Mean: Resource for statisticians called as legal experts in a trial (created 2013-08-14).
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I found a couple of nice PowerPoint slideshows that outline some of the issues that you should consider if you are hired to present an expert opinion about a statistical matter in a court of law.
This page was written by Steve Simon and is licensed under the Creative Commons Attribution 3.0 United States License. Need more information? I have a page with general help resources. You can also browse for pages similar to this one at Human Side of Statistics.