; or (2) an individual has attempted to purchase a firearm on behalf of another individual. (n) (1) Each licensed dealer shall prominently display at the business premises subject to the license to deal in firearms issued to the licensed dealer under this section— (A) the license; (B) the name and license number of each individual who is licensed under this section to sell firearms at the business premises; and (C) a toll-free telephone number established by the Attorney General at which any individual, at any time of day, may immediately report illegal, suspicious, or alarming behavior. (2) The Attorney General shall establish a toll-free telephone number to which any individual, at any time of any day, may immediately report illegal, suspicious, or alarming behavior in relating to conduct at, or on the curtilage of, any business premises subject to a license to deal in firearms issued under this section. (o) Each licensed dealer shall successfully complete an annual training course, certified by the Attorney General, in reducing the risk of gun violence through identifying high-risk behaviors of customers for firearms or ammunition, and in such other matters relating to dealing in firearms as the Attorney General shall prescribe by regulation, that includes at least 40 hours of classroom training. . (b) Enforcement Section 923(e) of such title is amended— (1) by inserting after the 2nd comma the following: suspend or revoke a license to deal in firearms issued to a licensed dealer who violates subsection (m), (n), or (o), or ; and (2) by inserting after the 2nd sentence the following: The determination as to whether to suspend or revoke a license to deal in firearms issued under this section shall be based on the number of requirements of this chapter which have been violated by the licensed dealer. .