You should definitely pick up the misdemeanor warrant, but prior to that you should obtain an attorney familiar with DWI cases. Do not make any statements to the police about the accident or anything without your attorney present.
Hire a lcal criminal defense lawyer before you do anything else.
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He should just mail it to you. There are a lot of issues here, but generally, they may bring charges within that time period. Howeve, identification may be an issue, preservation of evidence may be an issue, etc. So, go see an attorney who deals in this area.