US soldiers from Viper Company (Bravo) 1-26 Infantry patrol at Combat Outpost (COP) Sabari in Khost province in the east of Afghanistan June 22 2011.

从毒蛇公司(cong2 du2 she2 gong1 si1)(喝彩声)，1 - 26在战斗前哨(COP) SABARI步兵在霍斯特在阿富汗东部，2011年6月22日省巡逻的美军士兵。

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Los Angeles (CNN) -- A veteran Los Angeles County sheriff's deputy and his younger partner sat tensely in their car Thursday in the same patrol district where a former LAPD cop -- now on the run, accused in three killings -- used to work.

CNN: STORY HIGHLIGHTS

Even in states where every local cop attends the same state-level academy, the state patrol almost always has their own.

FORBES: Do Law Enforcement Officers Have "A Code" Or A Culture Where They Overlook The Transgressions Of Other Cops Or Retired Cops?