It is hereby declared and directed that use of 'certified United States mail with return receipt requested,' or 'certified mail,' 'restricted delivery' shall be a full and complete legal compliance with the statutes of Oklahoma permitting, directing, or requiring use of 'Registered United States mail' or 'certified United States mail' or 'certified United States mail' a return receipt requested, or 'certified United States mail,' 'restricted delivery,' or any other such similar designations by any person in a public or private capacity, and all provisions of the statutes of Oklahoma are hereby modified to effect such change. Laws 1961, p. 240, § 1; Laws 1977, c. 217, § 1.
Oklahoma Legal Code