In a January 23 ruling, a federal court in Missouri became the first to weigh in on a hotly contested issue: whether states have the legal authority to adopt restrictions on the roles of navigators. The Affordable Care Act requires each health insurance marketplace to train navigators to conduct outreach and offer assistance to consumers interested in enrolling in marketplace coverage. In a new blog post, Georgetown University Health Policy Institute’s Justin Giovannelli, Kevin Lucia, and Sabrina Corlette explore the significance of the federal court ruling for Missouri and the other states that have acted to restrict the work of navigators and other consumer assisters.