Cop Killer Bullet

A popular term—created by the news media—for a bullet that is said to easily penetrate soft body armour—i.e., bullet-proof vests—worn by law enforcement officers (‘cops’); the Rhino bullet, referred to many as a cop killer bullet, does not penetrate soft body armour
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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Perhaps Holder's talk about "cop killer bullets" is just playing to the gun control crowd.
More commonly, these were referred to as "cop killer bullets" that purportedly defeated body armor worn by law enforcement officers.
It was also instrumental in influencing the manufacture and sale of armor-piercing ammunition, better known as "cop killer bullets."