In this article I examine one condition a minimalist theory of criminalization might contain: the criminal law should be used only as a last resort. I discuss how this principle should be interpreted and the reasons we have to accept it. I conclude that a theory of criminalization should probably include the (appropriately construed) last resort principle. But this conclusion will prove disappointing to those who hope to employ this principle to bring about fundamental reform in the substantive criminal law. (...) I argue that the last resort principle may not help to reverse the growth of the criminal law to any degree that could not be achieved more directly and less controversially by other principles that a theory of criminalization is generally thought to include. Unless we reject others parts of conventional wisdom about crime and punishment, the application of a last resort principle is unlikely to bring about sweeping changes that theorists might have anticipated. (shrink)