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The Misuse of Patent Law Experts: An Embarrassment to Our Profession

By Joseph N. Hosteny

What role should patent law experts play in modern litigation? Rule 702 of the Federal Rules of Evidence allows experts to testify about their opinions when such testimony will assist the trier of fact. The testimony must be “based upon sufficient facts or data,” must be “the product of reliable principles and methods,” and the witness must have “applied the principles and methods reliably to the facts of the case.” Fed. R. Evid. 702.

The comments by the Advisory Committee for the Rules of Evidence in 2000 give a list of factors that can be used to measure the reliability of expert testimony:

  • Is the expert testifying about what he does for a living?
  • Are the expert's conclusions logically related to his premise?
  • Has the expert considered alternative explanations?
  • Is the expert being as careful in his testimony as he would be in his profession?
  • Is the expert's field of expertise known for reaching reliable results?

Good guidelines. But when I apply these guidelines to patent law experts I have seen, almost all of them fail to pass these tests. That systematic failure to provide meaningful evidence in a reliable way indicates that most patent law experts should not be permitted to testify.

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