It does not take long for even a casual observer of criminal and civil trials to make two observations about expert witnesses. The first of these observations comes almost immediately: experts are vitally important to the judicial process. In many trials, the outcome largely depends upon which set of impressively credentialed experts the jurors (and the judge) believe. The second observation generally comes later than the first: a significant amount of shoddy "science," phony logic, faulty analysis, sleight of hand, and other assorted junk enters the courtroom dressed up in the emperor's clothes of expert testimony.
Stephen D. Easton,
"Yer Outa Here!" A Framework for Analyzing the Potential Exclusion of Expert Testimony Under the Federal Rules of Evidence,
U. Rich. L. Rev.
Available at: http://scholarship.richmond.edu/lawreview/vol32/iss1/2