; (2) approve the use of appropriate equipment, technology, procedures, personnel, and methods for conducting screening of such mail and cargo under the system; and (3) provide for the phased implementation of the system so that— (A) not later than 18 months after the completion of the research and development program required by section 5(a), 50 percent of such mail and cargo shall be screened under the system; and (B) not later than 3 years after the completion of that program, 100 percent of such mail and cargo shall be screened under the system. (c) Regulations (1) Interim final rule The Secretary may issue an interim final rule as a temporary regulation to implement this section without regard to the provisions of chapter 5 of title 5, United States Code. (2) Final rule (A) In general If the Secretary issues an interim final rule under paragraph (1), the Secretary shall issue, not later than one year after the effective date of the interim final rule, a final rule as a permanent regulation to implement this section in accordance with the provisions of chapter 5 of title 5, United States Code. (B) Failure to act If the Secretary does not issue a final rule in accordance with subparagraph (A) on or before the last day of the one-year period referred to in that subparagraph, the Secretary shall, not later than 10 days after such last day and every 30 days thereafter until the Secretary issues such a final rule, submit to the appropriate congressional committees a report— (i) explaining why the final rule was not timely issued