Yes, you can generally own your own breathalyzer in Arizona. Suzuki Law Offices advises clients, however, not to treat a personal reading as legal permission to drive or as proof that they cannot be arrested for DUI.
Arizona law prohibits driving while impaired to the slightest degree and driving with an alcohol concentration of 0.08 or more within two hours of driving or being in actual physical control. A person may therefore face a DUI allegation even when a personal device displays a number below 0.08.
For advice about how a private breath test may affect an arrest or pending case, contact our office for a free consultation with our Phoenix DUI Defense lawyers.
Can You Legally Own a Personal Breathalyzer in Arizona?
Yes. Arizona law does not generally prohibit buying or possessing a handheld breath alcohol tester for private use. The state’s DUI statutes regulate driving conduct and official chemical testing, while separate laws regulate certified ignition interlock devices installed in vehicles.
Although owning a personal breathalyzer in Arizona is generally lawful, the device does not change the alcohol limits or impairment standards that apply on the road. It also does not replace a breath or blood test administered during a DUI investigation.
A privately purchased tester and a state-required ignition interlock serve different purposes. One provides an informal personal estimate. The other is installed, calibrated, monitored, and reported under Arizona’s driver-licensing system.
Can a Personal Breathalyzer Tell You Whether You Can Drive?
No. A personal breathalyzer cannot confirm whether you are legally or physically safe to drive. A result below 0.08 does not rule out impairment, and Arizona permits prosecution when alcohol, drugs, or a combination of substances impair a driver to the slightest degree.
The displayed number may also change based on when you tested, when you stopped drinking, how you used the unit, and whether it was properly maintained. Alcohol concentration can change over time, so a reading taken before driving may not match a later test.
Do not rely on a personal device when deciding whether to drive after drinking. Arrange a sober ride instead.
Could Your Own Breathalyzer Results Be Used in an Arizona DUI Case?
Possibly. Whether your own breathalyzer results can be presented in court depends on the facts, the device, and whether the evidence satisfies Arizona evidentiary requirements. A party seeking to use the reading may need to establish:
- Which device produced the result.
- When the test occurred.
- Who performed the test.
- Whether the unit was maintained and calibrated.
- Whether the instructions were followed.
- Whether the stored record or photograph is authentic.
Arizona Rule of Evidence 901 generally requires enough evidence to support a finding that an item is what the party claims it is. Arizona DUI law also permits other competent evidence related to whether a person was under the influence. A private reading is not automatically accepted as accurate simply because a device displayed it.
Suzuki Law Offices may also examine what you told officers about the device. Your statements about testing, drinking, or the displayed result may become part of the prosecution’s evidence even if the device itself is never introduced.
Are Consumer Breathalyzers Accurate Enough to Affect a Case?
Some consumer devices may provide a useful estimate, but accuracy differs by model and condition. Federal testing standards and conforming-product lists apply to certain alcohol screening and evidential devices. A consumer product may not meet the same standards as equipment approved for law enforcement use.
A personal reading may be affected by:
- Poor or overdue calibration.
- Testing too soon after consuming alcohol.
- Mouthwash, medication, or another substance containing alcohol.
- Incorrect breathing or sampling technique.
- Battery, sensor, temperature, or storage problems.
- An inaccurate date or time setting.
One questionable reading does not prove that a police result is accurate or inaccurate. We compare the device history and test timing with body camera footage, police reports, official test records, and the full drinking timeline.
Can Owning Your Own Breathalyzer Help Your DUI Defense?
In limited situations, owning your own breathalyzer may produce information worth reviewing. A time-stamped result could help establish a timeline or show a substantial difference between a private reading and a later police test.
That difference does not automatically defeat the charge. Suzuki Law Offices must determine whether the device can be identified, tested, and supported by reliable records. We also consider whether the reading helps the defense or creates evidence the prosecution may try to use.
Preserve the Device and Its Records
Arizona gives a person who undergoes law enforcement testing a reasonable opportunity to arrange an additional test by a qualified medical professional. A handheld consumer reading is not the same as that independent test.
Do not discard, reset, alter, or continue using the device after an arrest. Preserve the unit, app data, receipts, instructions, calibration records, photographs, and packaging for your lawyer.
Do You Have to Give Police Access to Personal Breathalyzer Data?
Police do not automatically gain access to your device or connected application simply because you are arrested. Access may depend on whether you consent, where the information is stored, and what legal authority officers use to request it.
Some products store no history. Others create time-stamped records on a phone, online account, or cloud service. Deleting or changing potential evidence after learning of an investigation can create added legal problems.
Before answering detailed questions or voluntarily providing device data, contact an attorney. Suzuki Law Offices can assess the request, preserve helpful information, and advise you about responding without making unnecessary statements.
Talk to Suzuki Law Offices About a Personal Breathalyzer and DUI Evidence
You may legally purchase a personal breathalyzer, but its reading does not override Arizona DUI law or prevent an officer from making an arrest. Its value in a defense depends on its reliability, the test timing, the preserved records, and how the result compares with the state’s evidence.
RJ Suzuki is a former Assistant United States Attorney and former federal prosecutor. Our team also includes former law enforcement investigators who understand how to review testing procedures, device records, police reports, and video evidence.
Suzuki Law Offices is available 24/7, including weekends. Contact us for a free consultation so we can evaluate the breath-test evidence and explain your legal options.
Call or text (602) 682-5270 or complete a Free Case Evaluation form