When an individual who appears in a representative capacity signs a paper in practice before the Department, his signature shall constitute his certificate:
(a) That under the provisions of this part and the law, he is authorized and qualified to represent the particular party in the matter;
(b) That, if he is the partner of a present or former officer or employee, including a special Government employee, the matter in respect of which he intends to practice is not a matter in which such officer or employee of the Government or special Government employee participates or has participated personally and substantially as a Government employee through decision, approval, disapproval, recommendation, the rendering of advice, investigation or otherwise and that the matter is not the subject of such partner's official Government responsibility;
(c) That, if he is a former officer or employee, including a special Government employee, the matter in respect of which he intends to practice is not a matter in which he participated personally and substantially as a Government employee through decision, approval, disapproval, recommendation, the rendering of advice, investigation, or otherwise, while so employed and, if a period of one year has not passed since the termination of his employment with the Government, that the matter was not under his official responsibility as an officer or employee of the Government; and
(d) That he has read the paper; that to the best of his knowledge, information, and belief there is good ground to support its contents; that it contains no scandalous or indecent matter; and that it is not interposed for delay.