The purpose of the arraignment itself is to notify him of the charges and to provide the specifications that you are inquiring about.
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Once he gets an attorney on his case, the attorney will get a copy of the police report and then his attorney will discuss it with him. He does not have a right to get any more than that prior to his arraignment. At the arraignment, he will be told what the charges are but he'll have to wait to get more information. And he cannot get the police report ahead of time. His attorney will get it after the arraignment.