12 C.F.R. § 614.4255
(a) Prohibitions. For all personal and intangible property, and for all real property exempted under § 614.4260(c) of this subpart, no person may:
(b) Officers and employees. If the institution's internal control procedures required by § 618.8430 of this chapter include requirements for either a prior approval or post-review of credit decisions, officers and employees may:
(c) Real estate appraiser. Except as provided in § 614.4260(c) of this subpart, all evaluations of real property that serve as the primary security for a loan shall be performed by a qualified real estate appraiser who has no direct or indirect interest, financial or otherwise, in the loan or subject property and is not engaged in the marketing, lending, collection, or credit decision processes of any of the following: