A missing Miranda warning does not automatically get your DUI thrown out. What it can do is keep certain things you said out of evidence. That is a real advantage, but it is narrower than most people expect.
Miranda only applies once two things are both true: you are in custody, and the officer is questioning you. Roadside questions during a traffic stop usually do not count, because courts often treat that early stage as non-custodial. So when the officer asks how much you had to drink or where you are coming from before an arrest, those answers can still come in even without a warning.
Once you are actually arrested and then questioned, Miranda kicks in. If police skip the warning and keep asking questions, a judge can suppress your answers. Miranda does not touch physical evidence like your breath or blood result, and it does not cover things you volunteer without being asked.
Here is the bigger point. Even if your statements stay in, the traffic stop, the field sobriety tests, and the chemical testing all have their own rules that can be challenged. A Miranda issue is one piece of a full defense review, not the whole case.
Joe Crudo reads the police reports closely to spot exactly these problems. See common DUI defenses or what to do after a DUI arrest.
This is general information, not legal advice, and every case turns on its own facts. Call Crudo Law at (858) 622-7280 or visit /contact for a free, confidential consultation.