DUI's are looked on the same way as other crimes such as drug possession. If you want to help your friend you should let him know what's going on. If you can't do that, you should politely decline.
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My answers are intended only as general legal advice and are not intended to create an attorney-client relationship. There is no substitute for a full consultation with a local experienced criminal defense attorney. For more answers based on my 19 years of experience visit my website, www.austincriminaldefenseattorney.com