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?