There was no immediate comment from Condit's attorneys on Smith's latest statements, which came as police negotiated with Condit's lawyers over a lie detector test and DNA samples as part of the probe into Levy's disappearance.

CNN: Anne Marie Smith

To investigate whether acid reflux is involved at all, doctors can do a 24-hour pH test, inserting an acid-sensitive probe through the patient's nose into the esophagus, where it records any episodes of reflux.

WSJ: Why Your Heartburn Drugs Don't Work

Gen-Probe, like Biosite a San Diego firm, made its mark in 1985 with a test for Legionnaires' disease.

FORBES: Investment Guide