Proving a negative is devilishly difficult That is why the burden of proof is on the one making the claim State a reliable source verifying the claim that there is no mention whatever of ACT in any protocol or recommendation of any of the organizations mentioned Moreover cite a source verifying the claim that mention of a group in a protocol or recommendation constitutes recognition or acceptance by these  organizations Cite a source even to verify the claim that any of the groups mentioned recognize or accept advocacy groups as a matter of policy Most especially cite a reliable source that recognition by these groups is a requirement to be a part of the mainstream of the mental health professional community or even what that community is Most especially cite a reliable source for the claim that ACTs advice is not sought by these groups nor intended to be so by the organizations mentioned  Without verifiability of the statements made the entire section must go and I am prepared to delete it It can be reinstated when verification is found