Halotus' Poisoned Feather

Origin
Halotus was a servant to Roman emperor Claudius, acting as his food taster and steward. Along with Agrippina the Younger, the wife of Claudius, Halotus was considered to be one of the strongest suspects when Claudius was murdered by poison. Although the public clamored for his execution, succeeding emperors Nero and Galba spared him. In fact, they kept Halotus as chief taster and later promoted him to a powerful, wealthy citizen.

Effects
Sucking on the feather negates the effects of the poison at the cost of turning the user's tongue poisonous. Anything they say will be misinterpreted by the listener, who will want the person punished for their crimes. However, this effect does not apply to the rich or elite.