Some stakeholders called on medical boards to sanction physicians for spreading misinformation during COVID-19 and discussing off-label medications. In 2022, California passed AB 2098, which classifies physician dissemination of misinformation as unprofessional conduct subject to discipline by the state medical board. This article describes the purpose and function of state medical boards, the law relating to off-label prescribing, and why using medical boards to discipline physicians for discussing controversial opinions exceeds the traditional role of state medical boards. Though physicians do have a duty to provide accurate information to the public, defining misinformation is difficult and poses five distinct problems. Although California's law was repealed, this article asserts that disciplining physicians for disseminating misinformation could pose Constitutional concerns, hinder physicians' ability to practice medicine, or suppress information that is important to the public interest.