((a)) Subject to , the Secretary of the Treasury may—

((1)) regulate the practice of representatives of persons before the Department of the Treasury; and

((2)) before admitting a representative to practice, require that the representative demonstrate—

((A)) good character;

((B)) good reputation;

((C)) necessary qualifications to enable the representative to provide to persons valuable service; and

((D)) competency to advise and assist persons in presenting their cases.

((b)) Any enrolled agents properly licensed to practice as required under rules promulgated under subsection (a) shall be allowed to use the credentials or designation of “enrolled agent”, “EA”, or “E.A.”.

((c)) After notice and opportunity for a proceeding, the Secretary may suspend or disbar from practice before the Department, or censure, a representative who—

((1)) is incompetent;

((2)) is disreputable;

((3)) violates regulations prescribed under this section; or

((4)) with intent to defraud, willfully and knowingly misleads or threatens the person being represented or a prospective person to be represented.

((d)) After notice and opportunity for a hearing to any appraiser, the Secretary may—

((1)) provide that appraisals by such appraiser shall not have any probative effect in any administrative proceeding before the Department of the Treasury or the Internal Revenue Service, and

((2)) bar such appraiser from presenting evidence or testimony in any such proceeding.

((e)) Nothing in this section or in any other provision of law shall be construed to limit the authority of the Secretary of the Treasury to impose standards applicable to the rendering of written advice with respect to any entity, transaction plan or arrangement, or other plan or arrangement, which is of a type which the Secretary determines as having a potential for tax avoidance or evasion.