(1) A duly completed statement purporting to have been supplied under section 17 shall, until the contrary is shown, be sufficient evidence in any proceedings under the Road Traffic Acts, 1961 to 1994, of the facts stated therein, without proof of any signature on it or that the signatory was the proper person to sign it, and shall, until the contrary is shown, be sufficient evidence of compliance by the member of the Garda Síochána concerned with the requirements imposed on him by or under this Part prior to and in connection with the supply by him pursuant to section 17 (2) of such statement.

(2) A duly completed form under section 18 shall, until the contrary is shown, be sufficient evidence in any proceedings under the Road Traffic Acts, 1961 to 1994, of the facts stated therein, without proof of any signature on it or that the signatory was the proper person to sign it, and shall, until the contrary is shown, be sufficient evidence of compliance by the designated doctor or designated nurse concerned with the requirements imposed on him by or under this Part.