If there is an allegation by a person in good faith, I can only assume the commission would investigate it in a proper fashion, without being judgmental, etc., simply to follow up a matter, which is of relevance to the commission's work. Since you can get around the candidate by simply informing the candidate and have the candidate do it, the candidate may say, well, I don't have direct knowledge, but if you do, why don't you go, and then the whole thing is frustrated.
Comme vous pouvez contourner le candidat simplement en l'informant et en demandant au candidat de le faire, le candidat peut dire, eh bien, je n'ai pas de connaissance directe mais, si vous en avez, pourquoi ne le faites-vous pas, et la question est réglée.