If I read that correctly - you must be placed under arrest before they can compel you to be tested, and invoke the implied consent law. They can't just randomly say "hoot in the box" if they stop you for speeding or some such thing.
I do not believe that you are reading it correctly, during a stop, if a police officer suspects you of driving under intoxicants, they can demand that you blow. Implied consent is not something that gets invoked, its part of the terms that you agree to when you get behind the wheel in Oregon.
Again, I'm not a lawyer, so your refusal or acceptance of a test is on you; talk to your lawyer...