ABSTRACT
Misinformation has challenged the rollout of COVID-19 vaccination around the world. In 2021, professional bodies for several regulated occupations (including doctors and lawyers) initiated investigations into the conduct of members who engaged in vaccine misinformation, including on social media. This commentary discusses key controversies surrounding this novel disciplinary issue, with the focus on the legal profession in New Zealand and Australia. We consider the difficulties of defining "vaccine misinformation", differentiating between public and private social media use, giving proper scope to rights of free speech, and challenges in identifying financial conflicts of interest and unethical client solicitation practices (eg, profiting from spreading vaccine misinformation). The chilling effect upon freedom of expression when lawyers are disciplined for their social media posts that are deemed unscientific is discussed.