My chiropractor remembers the trial where 3 Chiropractors took the AMA to court for those very kinds of things. He knew a couple of doctors who did lose their license for just recommending a chiropractor. Pure pharmaceutical domineering of the field so that they got all the profits.
One AMA rep even said in open court on the stand, the chiropractors were 'stealing' the doctor's profits. And doctors testifying that yes indeed they were threatened with license loss and told they would never work in medicine again if they dare say anything positive about chiropractic.
The cartel lost. The judge was appalled at the rampant corruption and control with threats and licensing extortion at the AMA's hand. That's why chiropractic is far more accepted today than it was when I was a kid. It fought the cartel's minions the AMA and won.
Since Dr. Clark found a parasite involved in every one of their money maker 'diseases' except high blood pressure (cadmium build up in kidneys), would the AMA allow anti- parasite technology to be endosed, if they threw such a hissy fit about chiropractors??