General shall register under this part practitioners at Centers of Excellence in Cannabis Research designated under section 409L of the Public Health Service Act to conduct research with marihuana. No separate registration shall be required for each individual employed by a Center of Excellence in Cannabis Research who is conducting research described in subsection (a)(1) of that section and in accordance with applicable State and local laws, nor shall separate registrations be required for distinct research activities, including research activities related to distinct constituent compounds of marihuana or amended protocols. The registration shall expire on the date on which the entity is no longer designated as such a Center of Excellence in Cannabis Research under that section. A Center of Excellence in Cannabis Research registered under this part may cultivate marihuana, including any constituent component of marihuana, to conduct research under this part if the Attorney General has determined that the research to be conducted is for legitimate scientific research and is consistent with effective controls against diversion. A Center of Excellence in Cannabis Research may contract with such additional manufacturers of marihuana registered under this section to meet the needs of the Center of Excellence in Cannabis Research to the maximum extent permissible under international treaties to which the United States is a signatory and which govern marihuana. Before entering into such contract, the Center of Excellence in Cannabis Research shall submit to the Attorney General a request to enter into the contract that includes information to demonstrate the experience or capability of the contractor to conduct such cultivation and assurances that the contractor will comply with the provisions of this Act. Not later than 60 days after the date on which the request is submitted, the request shall be deemed to be approved by the Attorney General, unless the Attorney General determines that the granting of such request