What does the sign in mug shots say?

Question: What does the sign in mug shots say!?
Best Answer - Chosen by Asker:

prisoner arrest report number, sometimes the prisoner's name also!.

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I think it has a number on it!. I think they keep track of the prisoners by numbering them!. If you wanted to take a picture of someone posing for a mug shot you could be funny and make the sign say HELP or something!.Www@QuestionHome@Com

everything you ever wanted to know about MuG ShotsWww@QuestionHome@Com

it identifies there prisoners and that's a place where you don't want to be at trust me I've been there and it's not fun Www@QuestionHome@Com

What sign!? MIne never had signs!.Www@QuestionHome@Com