; and (ii) provides a researcher described in clause (i) with a decision not less than 30 days after the date on which the research protocol is submitted. (D) (i) Not later than 60 days after the date on which the Attorney General receives a complete application for registration under this paragraph, the Attorney General shall approve or deny the application. (ii) For purposes of clause (i), an application shall be deemed complete when the applicant has submitted documentation showing that the requirements under subparagraph (A) are satisfied. (iii) In the case of a denial under clause (i), the Attorney General shall provide a written explanation of the basis for the denial and a description of any curative steps that may be taken for such request to be approved. (E) (i) A researcher registered under this paragraph shall store marijuana to be used in research in a securely locked, substantially constructed cabinet. (ii) Except as provided in clause (i), any security measures required by the Attorney General for practitioners conducting research with marijuana pursuant to a registration under this paragraph shall be consistent with the security measures for practitioners conducting research on other controlled substances in schedule II that have a similar risk of diversion and abuse. (F) (i) If the Attorney General grants an application for registration under this paragraph, the applicant may amend or supplement the research protocol without reapplying if the applicant does not— (I) change the type of drug, the source of the drug, or the conditions under which the drug is stored, tracked, or administered