Okla. Stat. tit. 73, § 73-158.1: Article X, § 29 certificate required for bonds – Prima

facie evidence.

All bonds issued hereunder shall have on the backs thereof the

certificate required by Section 29 of Article X of the Constitution

of Oklahoma. Such bonds and any bonds or other obligations issued

by the Oklahoma Capitol Improvement Authority shall be submitted to

the Attorney General of Oklahoma for examination; and such bonds,

when having been examined and certified as legal obligations by the

Attorney General in accordance with such requirements as he or she

may make, shall be incontestable in any court in the State of

Oklahoma unless suit thereon shall be brought in a court having

jurisdiction thereof within thirty (30) days from the date of such

approval. Bonds so approved by the Attorney General shall be prima

facie valid and binding obligations according to their terms, and

the only defense which may be offered thereto in any suit instituted

after such thirty-day period shall have expired shall be forgery,

fraud or violation of the Constitution.