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Wikipedia:Verification "policy requires that all quotations and any material challenged or likely to be challenged be attributed to a reliable, published source in the form of an inline citation, and that the source directly support the material in question."

Unfortunately that appears not the be the case in practice. I have discovered that it is possible for an editor to repeatedly insert assertions supported only by his own unpublished research; to commission his friends to insert it for him; edit war to keep it in; threaten anyone who questions him with personal attacks and false accusations -- and nothing happens.