1876
Written by Chris Dalrymple, DC   
Friday, August 14, 2015 08:31 AM

The phrase "school of thought"  originates 1864.  – Etymology Online "School (n.1.)

The practice of medicine was deregulated during the first half of the 1800s.  This period saw the growth of new schools of thought about how to practice medicine.  Lay healers, bone setters, botanic Thompsonians, homeopaths, eclectics, and others began to offer medical services, and these ‘new schools’ of medicine rapidly produced practitioners for the masses.  – Source:  The Physician's Perspective on Medical Law, Volume 2

In 1876 Texas updated its constitution. It states: the Legislature may pass laws prescribing the qualifications of practitioners of medicine in this State, and to punish persons for malpractice, but no preference shall ever be given by law to any schools of medicine.  

This provision remains today.