Can You Refuse a Breathalyzer in Nevada?
In Nevada you cannot lawfully refuse the evidentiary breath or blood test once you have been lawfully arrested for DUI. Nevada's implied-consent law (NRS 484C.160) treats driving on the state's roads as consent to testing, and since 2013 an officer who is refused can obtain a telephonic warrant and use reasonable force to draw your blood. What you can decline are the roadside tests before arrest — the handheld preliminary breath test (PBT) and the field sobriety tests are voluntary. Refusing the evidentiary test does not make the case disappear: it can be used as evidence against you and can lead to a forced blood draw — but the results can still be challenged for how the sample was taken, stored, and analyzed. Freedom First Criminal Defense and DUI Lawyers reviews exactly how your test was handled, free and 24/7, at (702) 857-7197.
What to look for
The handheld preliminary breath test (PBT) and field sobriety tests are voluntary in Nevada. You can politely decline them without the automatic license penalty that applies to the evidentiary test.
Once lawfully arrested for DUI, the evidentiary breath or blood test is required under implied consent (NRS 484C.160). Refusal allows a warrant and a forced blood draw.
A refusal can be introduced as evidence of consciousness of guilt and can trigger a license revocation — but it is not the end of the case.
Calibration records, operator certification, the 2-hour testing window, and blood chain-of-custody are all grounds to suppress or undercut the result.
Two different moments people confuse
Most people picture one "breathalyzer," but there are two very different tests at two different moments. The first is the roadside preliminary breath test, given before arrest alongside the field sobriety tests to build probable cause — that one is voluntary. The second is the evidentiary test (a station breath machine or a blood draw) given after a lawful DUI arrest — that one is covered by implied consent and is not optional.
Confusing the two is how people accidentally hurt their case. Declining the voluntary roadside tests is your right; refusing the post-arrest evidentiary test triggers the implied-consent consequences below.
What implied consent actually allows in Nevada
Under NRS 484C.160, driving in Nevada counts as consent to evidentiary testing if you are lawfully arrested for DUI. If you refuse, Nevada law lets the officer use reasonable force and obtain a warrant to draw your blood. Nevada is among the states that authorize this — so "just refusing" rarely prevents the State from getting a sample.
A refusal can also be used against you at trial and can lead to a separate license revocation through the DMV, which runs on its own 7-day hearing deadline.
Refusal is not a dead end — the result can be attacked
Whether you took the test or it was drawn under a warrant, the result is only as good as the procedure behind it. Breath machines must be properly calibrated and operated by a certified technician. Blood must be drawn, sealed, stored, and tested through an unbroken chain of custody. Nevada's evidentiary testing also has timing rules that can be challenged when the sample was taken long after driving.
These are the pressure points a DUI defense attorney targets — often the difference between a conviction and a reduction or dismissal.
Frequently asked questions
Can I legally refuse a breathalyzer in Nevada?
You can decline the voluntary roadside preliminary breath test and field sobriety tests. You cannot lawfully refuse the evidentiary breath or blood test after a lawful DUI arrest — under implied consent (NRS 484C.160) refusal allows a warrant and a forced blood draw.
What happens if I refuse the evidentiary test?
Police can obtain a warrant and use reasonable force to draw your blood, the refusal can be used against you in court, and your license can be revoked. You have 7 days to request a DMV hearing.
Are field sobriety tests required in Nevada?
No. Field sobriety tests and the handheld roadside breath test are voluntary. The mandatory test is the evidentiary breath or blood test after arrest.
If my blood was drawn, can the result still be challenged?
Yes. Calibration, operator certification, the testing window, and blood chain-of-custody are all grounds to challenge or suppress the result. A free case review can identify which apply. Call (702) 857-7197.
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