A Betazoid investigator on the staff of Admiral Norah Satie, whose sense that crewman Simon Tarses is hiding something widens her inquiry in The Drumhead.
Sabin Genestra is a full Betazoid who works as an aide to the retired admiral Norah Satie. He appears in the fourth-season episode The Drumhead.
He comes aboard the Enterprise with Satie to look into an apparent act of sabotage and the spying of the Klingon exchange officer J'Dan. During the questioning of the medical technician Simon Tarses, Genestra senses that the young man is concealing a great fear, and on that basis alone names him as a likely conspirator. He later confronts Tarses in open hearing with the accusation, unsupported by evidence, that he used a corrosive on the hatch.
Picard protests against relying on a telepath's impression. Tarses's secret is only that his grandfather was Romulan, not Vulcan.