; (ii) authorizes that agent or employee to perform research under the registration of the registered researcher; and (iii) affirms that any act taken by that agent or employee involving a controlled substance shall be attributable to the registered researcher, as if the researcher had directly committed the act, for purposes of any proceeding under section 304(a) to suspend or revoke the registration of the registered researcher; and (D) the Attorney General does not, within 30 days of receiving the information, authorization, and affirmation described in subparagraph (C), refuse, for a reason listed in section 304(a), to allow the agent or employee to possess the substance without a separate registration. . (c) Single registration for related research sites Section 302(e) of the Controlled Substances Act ( 21 U.S.C. 822(e) ) is amended by adding at the end the following: (4) (A) Notwithstanding paragraph (1), a person registered to conduct research with a controlled substance under section 303(f) may conduct the research under a single registration if— (i) the research occurs exclusively on sites all of which are— (I) within the same city or county; and (II) under the control of the same institution, organization, or agency; and (ii) before commencing the research, the researcher notifies the Attorney General of each site where— (I) the research will be conducted; or (II) the controlled substance will be stored or administered. (B) A site described in subparagraph (A) shall be included in a registration described in that subparagraph only if the researcher has notified the Attorney General of the site— (i) in the application for the registration; or (ii) before the research is conducted, or before the controlled substance is stored or administered, at the site. (C) The Attorney General may, in consultation with the Secretary, issue regulations addressing, with respect to research sites described in subparagraph (A)— (i) the manner in which controlled substances may be delivered to the research sites