Quackwatch lists Bircham as a questionable non-accredited school.
Quackwatch has also been cited or mentioned by journalists in reports on therapeutic touch, Vitamin O, Almon Glenn Braswell's baldness treatments, dietary supplements, Robert Barefoot's coral calcium claims, William C. Rader's "stem cell" therapy, noni juice, shark cartilage, and infomercials.
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Donna Ladd, a journalist with The Village Voice, says Barrett relies heavily on negative research in which alternative therapies are shown to not work.
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Stated income is also derived from usage of sponsored links, including Amazon.com, ConsumerLab.com, HealthGrades, Inc, and Netflix.
Harriet Hall has written critically about SPECT scans in articles for Quackwatch and for the Science-Based Medicine website.
Chiropractic Abuse, published by the American Council on Science and Health and edited by Stephen Barrett, the webmaster of Quackwatch, chronicles Longs's three decades in the chiropractic industry.
A review by Harriet A. Hall on Quackwatch stated that some negative reviews of Trick or Treatment demonstrated "an appalling poverty of thought"; articulating that since the reasoning behind the author's conclusions is solid, critics instead deny the methods of science, misrepresent the book's contents and use ad hominem attacks against the authors.