Your husband needs to consult with local, experienced DUI defense attorneys in Bend, OR regarding what will happen in OR.
If your husband is convicted of a 1st offense DUI in OR, WI generally will suspend his driver license for 6 months. If his BAC was over a .15, WI may require an IID to be installed on any vehicle in his name for 1 year.
I wouldn't be too concerned about the car accidents but he will need an experienced lawyer from Bend. Look on AVVO for local attorneys. They can run you through the process. Good luck.
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Since WI is the only state in the union where a first offense is not crime, his bigger problem is what Oregon will do. Once a conviction is picked up here, as long as he did not refuse testing, and the case does not involve injury or minor passengers, he is looking at a 6-9 month revocation from WI and AODA assessment and compliance, unless they honor an Oregon court order for a longer revocation. There may also be an ignition interlock requirement depending upon the BAC level and or the specifics of the Oregon disposition. First and foremost, he needs a defense lawyer in Oregon. Good luck.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
Likely he will be able to enter DUII diversion. An Oregon DUII diversion lasts for one year. If he blew above a .08 Oregon will order his license to be suspended for 90 days. Wisconsin will honor that 90 day suspension, but they are not limited by the 90 days (they can impose a lengthier suspension as if your husband had commited the DUII in Wisconsin). Your husband will be ordered to attend treatment and a Victim Impact Panel both of which can be accomplished within Wisconsin. Assuming your husband completes treatment, stays out of trouble, and pays off his diversion fee the case will be dismissed in 1 year from his diversion entry date.
It is important to arrange with local counsel to see if your husband can waive his appearance at arraignement. Waiving his initial appearance will reduce your husbands return trips from 2 to 1. He will likely need to be in Oregon to enter Diversion.
This answer does not constitute an attorney client relationship. I am not your attorney.