Normative analysis of cognition-enhancing drugs frequently weighs the liberty interests of drug users against egalitarian values. Yet those who would refuse to engage in neuroenhancement may well find their liberty to do so limited in a society where such drugs are widespread. To the extent that unvarnished emotional responses are world-disclosive, neurocosmetics also threaten to foist faulty data upon all their users. This essay examines underappreciated liberty-based and epistemic rationales for regulating cognition-enhancing drugs. (Contains 28 notes.)