The polygrapher that gave Adam Shacknai his lie detector test, tells RadarOnline.com exclusively, that the results of the test were inconclusive, and that he recommended to the San Diego Sheriff's Department that another test be given.

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.