Keeping junk science out of the courtroom

Junk science gets into the courtroom in the guise of an expert witness who is called by a party to give an opinion about a technical matter on behalf of the party who called the expert. Attorneys take advantage of the fact that judges lack the background, or sometimes the will, to keep junk science out. We propose some new rules, which, if adopted, would help keep junk science out of the courtroom.