All cars we learn 'em like the back of our hand

from Jay Z – U Don't Know Lyrics on Rap Genius

Meaning

They make sure they remember what unmarked cop cars are driven by undercover cops so they can either run or hide their work when the cops come around.

Notice the subtle lights in the grill..

Some people can also point out a cop car from a distance based on details as small as the shape of a car’s headlights or bumper.

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