When presented with such a statement or court order, the person authorized to withdraw the blood, the employer and the hospital or other health care facility where the withdrawal or testing occurs may rely on such statement or order as evidence that the person has consented to or has been required to submit to the clinical procedure and shall not be required to obtain any additional consent, acknowledgement or waiver form. In such case, the person authorized to perform the procedure, the employer of such person, and the hospital or other health care facility shall not be liable in any action alleging lack of consent or lack of informed consent.
Okla. Stat. tit. 63, § 1-502.3