By John Cutler on April 20th, 2026 in DUI, Field Sobriety Test
A DUI test refusal in Idaho carries severe penalties and a very tight deadline to request a hearing to contest them.
Penalties for Refusing a Breath Test in Idaho
If you refuse a breath, blood, or other evidentiary test to determine your blood alcohol level, the following penalties apply:
- You will have to pay a $250.00 civil penalty.
- You will have to install a State-approved interlock system on any vehicle you operate, for a period of one year following the end of any suspension period.
- You will have an absolute suspension of your driver’s license for a period of 1 year if this is your first refusal, and an absolute suspension for two years if this is your second refusal within the last 10 years. An absolute suspension means you are not eligible for a work or other restricted permit to drive. If you have a CDL license, you will lose your CDL license for 1 year (absolute) for a first refusal and face a lifetime ban for any subsequent refusal.
People sometimes ask, “should I refuse the evidentiary test?” If the State doesn’t have an alcohol level, won’t that make their DUI case more difficult? If you are still weighing that question, our companion post on whether to take or refuse the breath test walks through the trade-offs in more detail. The harder questions are these: if I don’t have a valid reason to refuse, can I get along without a driver’s license for one or two years? Do I have a CDL that may be affected? Am I okay with an interlock device in every vehicle I operate for a year? Perhaps more important to the decision is that even if you refuse, the State can obtain a search warrant to draw your blood. If that occurs, you will be charged with the refusal, and the State will also get the test results it needs for the DUI charge.
If you proceed with a DUI test refusal, you only have 7 days to request a hearing to show cause why you refused. This is a very quick deadline and the penalties are severe. It is important that you obtain counsel right away.
At the hearing, you will need to show cause why you refused the breath test. The lawful reasons to refuse the evidentiary test are very limited and often depend on the particular circumstances of the case, which is why consulting experienced defense attorneys can be critical.
Defenses That May Block Refusal Penalties
The following grounds can sometimes defeat a refusal charge at the ALS hearing:
- The officer lacked reasonable grounds to request the test. Idaho law requires officers to have a reasonable, articulable basis to believe you were driving under the influence before requesting an evidentiary test. If the stop itself lacked legal grounds, or if the officer skipped the standardized observations and field sobriety steps that justify a request, your refusal may not carry the standard civil penalties.
- You were not properly advised of the consequences of refusing. Under Idaho’s Implied Consent law, the officer must read you the warning that explains the civil penalty, the absolute one-year license suspension, and the interlock requirement before you decide whether to take the test. If the warning was skipped, garbled, or read in a way that confused what was being asked of you, you may have grounds to challenge the refusal at your ALS hearing.
- You tried to comply but were physically unable to provide a sample. Asthma, COPD, severe injuries, dental issues, and other medical conditions can prevent a driver from producing a valid breath sample even when honestly trying. If your inability to test was a medical limitation rather than a refusal, documentation from a treating physician can support a defense to the refusal charge.
This is not an exhaustive list, and these defenses are not as simple to present to the court as you may think. It is very important that you retain an attorney who is very familiar with and experienced at handling DUI cases.
So now you know about the consequences and deadline for refusing to take an evidentiary test to determine your blood alcohol level. For anyone facing these situations, it is important to consult experienced Idaho DUI attorneys. Please tell your friends, because it will be them, and not you, who may need this advice.
John E. Cutler and the Cutler Law Office, P.A. is a DUI and Criminal Defense Law Firm that has been helping people for 30 years. Mr. Cutler is one of the few attorneys in Idaho who is a member of the National College of DUI Defense.
