Best possible legal advice - hire a criminal attorney ASAP
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Attorney Walker is 100% correct! In a forum such as this we can give some general advice, but we would need all the facts to give you complete advice as to how you should proceed. At 19 years of age, your son has his whole life in front of him. It is worth the money to sit down with an experienced DUI defense attorney who can protect his rights.
Hands down, hire a criminal defense attorney. I know the cost can be high and daunting, but it is his future and there really isn't a dollar value you can ascribe to that.
No attorney client relationship is created by virtue of this answer. Further, answers are for information only and should not be relied upon unless there has been a formal consultation. Many cases are fact specific and there is simply no way an attorney could possibly provide complete advice without all the relevant facts.
You should hire an attorney with particular expertise in the area of OWIs/DUIs immediately. Your son only has 15 days to challenge the suspension of his license, therefore time is of the essence.
This post does not constitute legal advice and shall not be construed to create an attorney-client relationship. Every case has a unique set of facts requiring individualized attention.