Law Enforcement Officers Protection Amendment Act of 1999 - Amends the Federal criminal code to expand the definition of "armor piercing ammunition" to include a projectile that may be used in a handgun and that the Secretary of the Treasury determines to be capable of penetrating body armor.

Directs the Secretary to promulgate regulations based on standards to be developed for the uniform testing of projectiles to determine whether such projectiles are capable of penetrating National Institute of Justice Level II-A body armor.

Authorizes appropriations for the Secretary and the Attorney General to develop and implement, and promulgate regulations for, performance standards for armor piercing ammunition.