Okla. Stat. tit. 59, § 59-858-726: Uniform Standards of Professional Appraisal Practice -

Compliance required.

An Oklahoma certified real estate appraiser must comply with the

current edition of the Uniform Standards of Professional Appraisal

Practice, as promulgated by the Appraisal Standards Board of the

Appraisal Foundation when involved in a federally related

transaction or a real estate-related financial transaction of the

agencies, instrumentalities and federally recognized entities as

defined and recognized by the Financial Institutions Reform,

Recovery, and Enforcement Act of 1989, or when both the appraiser

and user of appraisal services agree in writing that the work

product is an appraisal, or when a written appraisal states that it

is in compliance with the Uniform Standards of Professional

Appraisal Practice.