The breathalyzer result is often the centerpiece of a Rhode Island DUI prosecution - and it is also one of the most challengeable pieces of evidence in the case. Rhode Island Department of Health regulations specify exactly how the Intoxilyzer machines used by police departments must be maintained, calibrated, and operated. Deviation from those requirements creates suppression grounds, and a granted suppression motion can collapse the per se theory of the prosecution entirely.
The defense angle is rarely about whether the machine "works" in some general sense. It is about whether the specific machine, on the specific date of the arrest, was operating within the documented parameters required by Department of Health rules and the manufacturer's specifications.
Rhode Island Breathalyzer Calibration - How the System Works
Rhode Island law requires that any chemical breath test offered as evidence be administered on a Department of Health-approved instrument by a certified operator under documented calibration. The current approved instrument is the Intoxilyzer 9000, used by police departments statewide.
The framework rests on three pillars:
- Approved instrument: The machine must be on the Department of Health-approved list
- Certified operator: The operator must hold a current Department of Health certification
- Documented calibration: The machine must be calibrated within the prescribed interval, with documentation
Failure on any pillar can support a motion to suppress the breath test result.
Calibration Schedule
Rhode Island Department of Health regulations require the Intoxilyzer to be:
- Calibrated: At intervals not exceeding those specified by the Department of Health (typically every 30 days for routine calibration check, with full re-certification on a longer cycle)
- Verified: With each test using a known alcohol standard solution that confirms the machine is reading within tolerance
- Maintained: Through manufacturer-recommended service intervals
Each calibration generates a written record. These records - the calibration logs, certification documents, and maintenance history - are subject to subpoena by the defense in any DUI case.
The Calibration Log Subpoena
One of the first defense moves in a breath test case is the subpoena of the calibration logs for the specific machine on the date of the test. The logs typically reveal:
- Whether calibration was current as of the test date
- Any "out of tolerance" readings in the lookback window
- Any maintenance flags or service requests
- The chain of operator certifications
- Any reported software anomalies
An out-of-tolerance reading in the immediate lookback window - even a small one - is grounds for suppression. So is an expired calibration certificate, an uncertified operator, or a documented machine fault.
Operator Certification
The Department of Health certifies breath test operators on a fixed cycle. Certification requires completion of an initial training course and ongoing refresher training. An expired certification is fatal to admissibility - the breath test is suppressed regardless of the underlying machine performance.
The certification check is straightforward: subpoena the operator's training and certification records, confirm they were current on the date of the test.
Procedural Compliance
Beyond machine and operator status, the test itself must be administered following the Department of Health protocol:
- Observation period: The operator must observe the subject for a minimum period (typically 15 to 20 minutes) before the test, ensuring no oral intake, vomiting, or regurgitation that could contaminate the sample
- Mouth check: The subject's mouth must be inspected for foreign substances, dental work, or other interference
- Two valid samples: The Intoxilyzer requires two valid breath samples within a tolerance band; if the two readings differ outside tolerance, neither is admissible
- Sample integrity: Insufficient sample volume, premature termination of the breath flow, or "deficient sample" indicators must be documented
A break in any of these procedures is a defense angle.
Common Suppression Grounds
- Expired calibration: The machine's last calibration check was outside the Department of Health-required interval
- Out-of-tolerance reading: Calibration logs show recent readings outside the ±5% tolerance band
- Uncertified operator: The operator's Department of Health certification was expired or had not been renewed
- Inadequate observation period: The operator did not document or did not maintain the required observation period
- Deficient sample: The two samples were outside tolerance or one was flagged deficient
- Software or maintenance flag: The machine had a documented service request or fault report active at the time of the test
- GERD, mouth alcohol, or contamination: The subject had a medical or physical condition that could produce a falsely elevated reading; documentation challenges follow
Source Code and Manufacturer Defenses
In some cases, defense attorneys pursue the source code and design specifications of the breath test instrument itself. Source code review can reveal known accuracy issues, software bugs, or design assumptions that affect specific user populations (high body temperature, certain breathing patterns, residual mouth alcohol from medications). These challenges are rare and resource-intensive, but they have produced suppression in select cases.
Frequently Asked Questions
How accurate is the Rhode Island breathalyzer?
The Intoxilyzer 9000 is rated at ±5% accuracy when properly calibrated and operated. Deviations from calibration, operator error, or sample contamination can produce readings significantly outside that range.
Can a Rhode Island breathalyzer test be challenged?
Yes. Calibration logs, operator certification, and procedural compliance are all subject to subpoena and challenge. A successful suppression motion eliminates the breath test result from the case.
How often must Rhode Island breathalyzers be calibrated?
The Department of Health prescribes the calibration interval. Routine calibration verification typically occurs every 30 days, with full re-certification on a longer cycle. The exact schedule is set by Department of Health regulations.
What is a "deficient sample" on a Rhode Island breathalyzer?
A deficient sample indicator means the breath sample volume or flow rate did not meet the machine's minimum threshold. A deficient sample reading is not admissible as evidence of a specific BAC.
What happens if my Rhode Island breath test is suppressed?
The state cannot use the breath test result against you. The case may still proceed under the impairment theory using officer observations and field sobriety test performance - but losing the per se evidence often collapses the strongest part of the prosecution's case.
Defense and Next Steps
Breath test challenges require fast action - the calibration logs and operator certification records must be subpoenaed before they are routinely overwritten or archived. If you are facing a Rhode Island DUI charge involving a breath test, contact The Law Office of Chad F. Bank for a confidential consultation. Available 24/7 at 401-573-2265.
For the broader statutory framework, see Rhode Island DUI laws.