How do American police badges work?

How do American police badges work?
I've watched T.V series,movies and read books (all Fiction) and they were all different
Three letters 1 numbers
One letter three numbers
Four numbers
Two, two
Also roll to fap tread
(I have gone to Questions and answers)

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Rollin

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Too vague

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I understand you Anons want to roll but can you answer my question?

1

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...

rollin'

It's not like they're all the same op. I'm sure they vary from state to state, from department to department.

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Fap for one hour, I believe in you

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and rolling

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Lmao I already got this one down

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I'm actually rerolling

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so where's your fap vid?

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47

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No whammy no whammy... STOP!

Welp, reroll

roll ing

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hopefully i don't need to make any social media accounts for this