Widespread scholarly agreement has it that Descartes' theory of judgment favors a compatibilist interpretation. This essay explains and rebuts the standard arguments made on behalf of compatibilist readings, while explaining and defending a libertarian interpretation. Along with relevant Fourth Meditation doctrines and texts, my analysis encompasses a much discussed 1645 letter discussing his account. Although some scholars view the letter as departing from the account of the Meditations, I argue that the two works present a consistent view – allowing us to take at face value that the letter purports to elaborate Descartes' intended meaning in the associated Fourth Meditation passage.