(a) Withheld or false information. A broker must not withhold information relative to any customs business from a client who is entitled to the information. Moreover, a broker must exercise due diligence to ascertain the correctness of any information which he imparts to a client, and he must not knowingly impart to a client false information relative to any customs business.

(b) Error or omission by client. If a broker knows that a client has not complied with the law or has made an error in, or omission from, any document, affidavit, or other paper which the law requires the client to execute, he must advise the client promptly of that noncompliance, error, or omission.

(c) Illegal plans. A broker must not knowingly suggest to a client or prospective client any illegal plan for evading payment of any duty, tax, or other debt or obligation owing to the U.S. Government.