; and (III) the law enforcement provides a copy of the agreement described in subclause (II) to the Attorney General. (ii) Update to list If a threat to national security justifies the purchase of a prohibited item under clause (i), the Attorney General shall publish an updated list of prohibited items or special justice items, as appropriate, under paragraph (1)(C) as soon as practicable. (3) Authority to prescribe regulations (A) In general The Attorney General may prescribe regulations that place restrictions and limitations on special justice items that may be purchased by law enforcement agencies using covered funds, based on the appropriateness of the use of the items in law enforcement activities. (B) Authorized elements The regulations prescribed by the Attorney General under subparagraph (A) may include the following: (i) Tiers of eligibility of law enforcement agencies to purchase special justice items using covered funds based on need of law enforcement agencies for particular items, size and capabilities of law enforcement agencies, or such other factors as the Attorney General may specify in the regulations. (ii) Restrictions on the numbers or types of special justice items that may be purchased by a particular law enforcement agency using covered funds, within a particular period of time, to law enforcement agencies in a particular region, or such other factors as the Attorney General may specify in regulations. (iii) Restrictions on the use of particular special justice items by law enforcement agencies purchased using covered funds based on size, capability, or such other factors the Attorney General may specify in the regulations. (iv) Requirements for memoranda of understanding or other appropriate agreements in the case of joint use of special justice items, purchased using covered funds, by more than 1 law enforcement agency. (c) Other restrictions and limitations on use of covered funds (1) Purchase of special justice items using covered funds (A) In general A law enforcement agency may not