No licensee shall introduce compressed natural gas (CNG) or hydrogen into any container if he has knowledge or notice that such CNG or hydrogen container or system was not installed in accordance with the statutes of the State of Oklahoma, and with the rules and regulations in effect at the time of installation. Exception: This section does not apply to motor fuel or mobile fuel containers and systems installed on vehicles licensed in states other than Oklahoma, provided, however, that no licensee shall be required to introduce CNG or hydrogen into any container and/or system that the licensee reasonably believes to be unsafe.
Okla. Admin. Code § 380:80-1-11