Famed polygraph expert Jack Trimarco is willing to give GOP presidential candidate Herman Cain a lie detector test, RadarOnline.com is exclusively reporting.

Cain is currently engulfed in a sexual harassment scandal in which at least four women accuse the Tea Party darling of wrongdoing.

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Cain told reporters at a news conference on Tuesday that he would be willing to take a lie detector test, under the right circumstances.

Adam Shacknai needs to be given another lie detector test in connection with the death case involving Rebecca Zahau, according to famed polygraph expert Jack Tramarco, RadarOnline.come is exclusively reporting.

Adam's billionaire brother Jonah Shacknai was dating Rebecca Zahau, who was found nude, and hanging from a balcony at the Medicis' CEO's mansion in Coronado, a wealthy suburb of San Diego. Cops contend that Rebecca killed herself.

Rebecca's family vehemently disagrees with the San Diego Sheriff's Department's conclusion that she committed suicide and are pushing for the investigation to be reopened.