Jacobson v. Massachusetts (1905)
During a smallpox outbreak, Cambridge required vaccination. Henning Jacobson refused and was fined $5. He argued the mandate violated his liberty.
The Supreme Court upheld the mandate 7-2 and the fine stood.
The ruling remains the foundation for state vaccine mandates and for the limits courts place on them.
Florida's fight is about which branch sets vaccine policy, but the underlying state authority traces back to this case.
