19 C.F.R. § 200.735-104a

An employee shall avoid any action, whether or not specifically prohibited by this subpart, which might result in, or create the appearance of:

(a) Using public office for private gain;

(b) Giving preferential treatment to any person;

(c) Impeding Government efficiency or economy;

(d) Losing complete independence or impartiality;

(e) Making a Government decision outside official channels; or

(f) Affecting adversely the confidence of the public in the integrity of the Government.