Under Suspicion of DUI - Can I Refuse to Answer Questions
The United States Constitution guarantees the right of every person not to be a witness against him/her self, even if under suspicion of DUI.
Usually, if you are an Arizona DUI suspect and an officer advises you of your rights pursuant to Miranda, you should invoke those rights and refuse to answer any questions.
You also have a right to have counsel present at every critical stage of the proceedings.
No matter what time of the day it is, you should request to speak with a lawyer.
The officer then has the obligation to give you a chance to speak to an attorney so long as it would not unnecessarily hinder the investigation.
Your lawyer can give you advice on other issues including your right to an independent test of your breath or blood to determine alcohol concentration.