It sounds like you were arrested but no charges were ever filed. The expungement statute (ORS 137.225) requires you to wait a full year for that type of arrest to be expunged. If, however, a charge was filed and dismissed, you are correct that it would be expungeable now. If you wish to discuss this further, feel free to contact my office at 541-482-2533 or 503-836-3420.
Posting details about a criminal case in a public forum is dangerous and could seriously damage your defense. Your anonymous questions could be tracked back to you by the prosecution. When in doubt, it may be a better idea to email or call a local attorney with a question rather than post it online.
An unfiled DUI charge with only an arrest should not prevent you from a visa stamping abroad, however, if requested that must be disclosed. In terms of eligibility of expunging the arrest record, please seek further assistance from a local criminal counsel in your area.
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you can apply for expunction after 1 year if there has been no charge. You have 4 more months it seems. I would also recommend considering not moving for expunction until the statute of limitations runs.