It is revealed that the poison was specifically keyed to Rodian physiology. Since both the victim (Farr) and his assistant, Lolo Purs , are Rodians—but only Farr died—Padmé realizes Lolo faked being poisoned.
Lolo Purs murdered Farr because she believed he was "weak" for involving Rodia in the war and for his previous (though eventually retracted) alliance with the Separatists. Viewing Guide & Lore Context [S2E15] Senate Murders
After her mentor, Senator Onaconda Farr, is poisoned, Padmé Amidala and Bail Organa launch a private investigation into the corrupt heart of the Republic. It is revealed that the poison was specifically
This episode is actually the conclusion of a political arc that begins in Season 3. For the best narrative flow, IMDb reviewers and Wookieepedia suggest watching in this order: S3E10: "Heroes on Both Sides" S3E11: "Pursuit of Peace" S2E15: "Senate Murders" Viewing Guide & Lore Context After her mentor,
Lieutenant Tan Divo is assigned to the case. His abrasive, seemingly incompetent approach frustrates Padmé, prompting her to investigate independently.