It's difficult to get an OWI 1st offense citation reduced, and I'd say close to impossible without a lawyer. Because the 1st offense isn't criminal in Wisconsin, a public offender won't be available to you.
If you want to challenge the citation, you probably should hire an attorney. Officers can't pull people over without a reason, though they don't necessarily have to tell the person right away. And an officer needs to have a justification for asking you to submit to the preliminary breath test on the side of the road. The most effective way to challenge those things is through your attorney.
One last thing that I always make sure to mention is that you either have already been given or you will receive a Notice of Intent to Administratively Suspend Operating Privilege. That suspension will take effect 30 days after you receive it if you don't file a request for an administrative hearing within 10 days of receiving it, so if you're thinking about contesting your citation and/or hiring an attorney, you should get that request filed as soon as you can.
In WI, an OWI charge cannot be amended or dismissed unless the court finds, on the record, that it is consistent with the public interest to do so, which it will not do without good reason, usually meaning proof problems for the prosecutor. A skilled defense attorney can help create those problems for the prosecutor.
Your post does not indicate what your test result was, or whether you have already responded to any notice of intent to suspend or revoke that may have been issued, either of which would be subject to a ten-day response deadline unrelated to your initial appearance in court.
You need to schedule a confidential consult with an experienced defense attorney today.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
I agree with the first two answers. I write to point you to some recent answers on another post that my assist you further: http://www.avvo.com/legal-answers/i-got-a-first-owi--if-i-pill-guilty-what-can-i-fac-1016927.html#answer_1832016.
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