Can I Refuse a BAC Test During a DUI Stop in Arizona?

Arizona’s Implied Consent Law

Under Arizona’s implied consent law, anyone who operates a motor vehicle on Arizona roads has already agreed to submit to breath, blood, or urine testing if lawfully arrested for DUI. When law enforcement suspects impairment, they will request one or more of these tests, and the officer chooses which type of test to administer. This is not a suggestion — it is a legal framework built into the privilege of driving in Arizona.

Consequences of Refusing a BAC Test

If a driver refuses testing after a lawful arrest, police can obtain a warrant to conduct the test anyway. Critically, the refusal itself triggers a one-year suspension of driving privileges, even for out-of-state licenses entered into national registries. This suspension is administrative — it happens regardless of whether you are ultimately convicted of DUI. The refusal can also be used as evidence against you in court, with prosecutors arguing that your refusal implies consciousness of guilt.

Exception: Investigative Detention vs. Arrest

There is an important distinction between pre-arrest investigation and post-arrest testing. During a roadside investigation before formal arrest, drivers can refuse portable breath tests without facing the one-year license suspension penalty. Portable breath test results are generally not admissible in court anyway. However, once you are formally placed under arrest for DUI, the implied consent obligation kicks in and refusal carries the administrative penalties described above.

Your Right to an Administrative Hearing

Drivers served with an MVD Admin Per Se or Implied Consent affidavit have 15 days to request an administrative hearing. An administrative law judge will then determine whether to uphold the suspension. This hearing is separate from your criminal DUI case and focuses specifically on whether the officer had reasonable grounds for the arrest and whether you were properly informed of the consequences of refusal. Missing the 15-day deadline means the suspension takes effect automatically.