; (2) the dealer has been the subject of a warning conference with the Attorney General within the preceding 36 months; or (3) in the preceding 12 months, the dealer was the source of 2 or more firearms that were used in a crime under Federal, State, or local law within 36 months after the last known retail sale of the firearm. . 8. Effective date Sections 2 through 6 shall take effect on the date that is 180 days after the date of the enactment of this Act.