According to Dr Dave Martin, in the The United States, since 1905, the Public Health Policy says that the State public health agencies are entitled 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 is something that only disrupts the severity of a disease (symptoms in the recipient), and not the infection or transmission rate of the pathogent that is believed to cause the disease.
[This data point need statutory links]