According to Dr Dave Martin, in the The United States, since 1905, the Public Health Policy says that the state public health agencies are entitles to do police powers on public health if they can disrupt infection or transmission. There is NO police power that has ever been granted, in any circumstance, for any reason, for a medical treatment. [1]
A therapy (treatment) is something that only disrupts the severity of a disease (for the recipient), and not the infection or transmission rate of the disease.
[This data point need statatory links]