Natural police.

from The Wire (Ft. David Simon) – McNulty's Eulogy on Rap Genius

The term “natural police” is used throughout the series to refer to the detectives and other officers who, regardless of politics, rank, or other extenuating circumstances, strive to close cases and get real work done. They do this because, being “natural police”, they are really the only ones with skills enough or drive enough to do so.

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