20. No alderman, councillor or employee of any municipality shall be exempted from testifying on the ground that he is no longer an alderman, councillor or employee.
He may also be compelled to disclose any remuneration or reward whatsoever received or which he hopes to receive on account of services by him rendered in his official capacity, before or since the transaction in question was accomplished.
R. S. 1964, c. 173, s. 20.