"...All unregistered providers of trauma counselling, psychotherapy and hypnotherapy services become members of a suitable professional organisation within their profession..."In the USA, Steve Eichel has demonstrated that such a recommendation may be of limited value.
According to his research, you don't even need to be homo sapiens to join some 'professional organisations'.
It's worth re-visiting his website, which has been updated with a follow-up article.
P.S. Don't miss the 141 Factor coverage.