buy-and-bust operation

(名詞) 臥底警察 (undercover police officers) 或緝毒幹員 (narcotics detectives ) 偽裝身份向毒販 (drug dealers) 購毒並加以逮捕的行動。

A narcotics cop wounded a drug suspect who pulled out a toy gun during a buy-and-bust operation in the Bronx early Wednesday, police said.

The borough's second police shooting in less than a week unfolded around 12:30 a.m. when an undercover officer approached Keith Johnson and offered him $30 for crack.
—Barry Paddock, Alison Gendar and Wil Cruz, "Drug suspect shot by cops in Bronx; 2nd shooting this week in borough," New York Daily News, July 8, 2009