The safety claim was central to the commercial viability of the Société de l’Harmonie Universelle and the credentialing of the practice’s wider network of operators. The 1784 confidential report of the royal commission addressed safety directly and warned of moral and physical risks arising from the intimate physical contact of operator and (typically female) patient during the production of ‘crises.’ The confidential report was not publicly released at the time but became part of the documentary record of the case and has been extensively cited in subsequent medical-historical literature. The safety claim is refuted by the commission’s own examination of the practice and by the broader concern about operator-patient dynamics in suggestion-mediated clinical states.