Il a un casier aussi long que mon bras.

Avoir un casier = To have a criminal record

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English Translation

He’s got a rap sheet as long as my arm.

Rap sheet means nothing to me, either!

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English Translation

He’s got a rap sheet as long as my arm.

“Rap sheet” is used to refer to someone’s criminal record, usually when they have been arrested quite a few times. I can’t confirm, but I’ve often heard that it comes from an abbreviation of “Record of Arrest and Prosecution”.

Thanks so much for the explanation.