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...and therein lies the challenge faced by almost every 'alternative' therapy or treatment technique, especially for psychological issues.
It's a general problem for psychological therapies (how do you do a double blind test in a talking cure, for example?) and nothing inherent to alternative therapies. Alternative therapies for skin cancer or broken bones are not at all difficult to test - their proponents just don't like the results.
...and therein lies the challenge faced by almost every 'alternative' therapy or treatment technique, especially for psychological issues. I have seen attitudes change though, especially over the past 5 or so years, even if the funding hasn't always followed suit. It's great to see mindfulness, acupuncture, and elements of the 12 Steps being adopted by hospitals, for example.