Beth Benton, An American experimented Cranio-Sacral Practitioner, graduated from BSc, MSc, and PhD. of Psychology in Texas A&M University. 1991 she was taken a Diploma course training in Cranio-Sacral Therapy at the School of Cranio-Sacral Practitioner in Scotland. 1999 she received a post graduated training in Pediatric Cranio-Sacral Therapy in Hamburg of Germany. She practiced Cranio-Sacral Therapy in USA, London, Paris more then 20 years and is a specialist in treating Cerebral palsy, Autism, ADHD, Reading difficulties of children.
It is not illegal to do CST here in America. It is a legal profession like Massage, Osteopathy or Chiropractic. You will find people or things on the Internet that say Chiropractic is also "Quackery". Some people have a very limited view of what can help people.
I am not sure what you are wanting to know. Yes there are people who think CST is Quackery, they also think Acupuncture is Quackery and Chinese Herbs but this is not necessarily the view of the Government. As long as you get the right licenses or certifications for the State you live in you can do these occupations here.
I hope this helps,