(a) Revocation of management. The Service shall have responsibility to review management of a species transferred to a state under this part and to determine whether or not the implementation of the state management program continues to comply with the requirements of the Act, this part and the state's approved management program.

(1) Upon receipt of any substantial factual information suggesting that the state management program is not being implemented or is being implemented in a manner inconsistent with the Act, this part, or the state's approved management program, the Service shall, as soon as practicable but not later than 30 days after receipt, determine whether or not the state continues to comply with the requirements of the Act, this part and the state's approved management program.

(2) Whenever pursuant to a review as specified in paragraph (a)(1) of this section, the Service determines that any substantial aspect of the state management program is not in compliance with the requirements of the Act, this part or the state's approved management program, it shall provide written notice to the state of its intent to revoke management authority, together with a statement, in detail, of those actions or failures to act upon which such intent to revoke is based. The Service shall publish notice of such intent to revoke in the Federal Register and invite public comment thereon, and shall conduct an informal public hearing on the matter if requested by the state or if the Service otherwise determines it to be necessary. The Service shall provide to the state an opportunity for consultation between the Service and the state concerning such actions or failures and necessary remedial actions to be taken by the state.

(3) If within 90 days after notice is provided under paragraph (a)(2) of this section, the state has not taken such remedial measures as are necessary, in the judgment of the Service, to bring the state management program into compliance with the provision of the Act, this part and the state's approved management program, the Service shall revoke the transfer of management authority by written notice to the state and publication in the Federal Register.

(b) Voluntary return of management authority to the Service. (1) If a state desires to return management of a species of marine mammals to the Service, it shall provide the Service notice of intent to return management. The Service shall accept the return of management, and such return shall become effective, upon publication of a notice in the Federal Register to this effect no sooner than 30 days (except in an emergency as determined by the Service) nor longer than 60 days after the state has provided notice of its intent to return management or unless otherwise agreed upon.

(2) If implementation of any aspect of the state management program is enjoined by court order, the state shall advise the Service of such injunction and its effect on the state management program. If the state determines that the effect of the injunction is to preclude effective conservation and management of the species under the terms of the state management program, it shall so notify the Service and such notification shall be treated as a notice of intent to return management as provided in paragraph (b)(1) of this section. If the state determines that the injunction does not preclude effective conservation and management of marine mammals under the terms of the state management program, it shall so notify the Service together with the basis for the state's determination and such notice shall be treated as a report submitted pursuant to the terms of § 403.06(c)(1) of this part. In either case, the state shall provide notice to the Service as soon as practicable but not more than 30 days after issuance of the injunction. Management authority returned to the Service pursuant to this paragraph may be re-transferred to the state, notwithstanding the requirements of § 403.03, when, in the judgment of the Service, the cause for return of management authority to the Service has been alleviated in such a way as to allow effective conservation and management of the species consistent with the requirements of the Act and this part.

(c) When revocation of a management authority pursuant to paragraph (a) of this section becomes final, or when a state returns management pursuant to paragraph (b) of this section, the Service shall resume such management authority and provide for the conservation of the species within the state in accordance with the provisions of the Act.