70. The clerk or the secretary-treasurer of the municipality is the returning officer of the municipality ex officio. He may refuse to act as such only with the authorization of the Commission municipale du Québec.
Where the clerk or the secretary-treasurer is unable or refuses to act or where the office of clerk or secretary-treasurer is vacant, his assistant is the returning officer ex officio. Where he has no assistant, or the office of assistant is vacant or the assistant is unable to act, the Commission shall appoint the returning officer.
The second paragraph does not apply where an election clerk is in office and he is not unable to act.
The Commission may, for cause, dismiss the returning officer after giving him an opportunity to be heard, and designate his substitute.