In 1937, at the age of 30, Regardie returned to the U.S., entering Chiropractic College in New York City.

Singh argues that this requirement by itself would have prevented the suit against him by the British Chiropractic Association from going forward.

In recent years, nontraditional medicine has expanded (chiropractic, acupuncture, folk healers, etc.), and 60 of those working in those areas are women.

The concept is used in fields such as medicine, nursing, health psychology, occupational therapy and physiotherapy as well as sociology, and particularly in more specialist fields such as psychiatry, health psychology, family therapy, chiropractic, clinical social work, and clinical psychology.

The science case that probably played the most significant role in the campaign was a suit filed by the British Chiropractic Association against science writer Simon Singh for an article he published in The Guardian in 2008, in which he discussed bogus treatments.