A breath result is only as trustworthy as the machine that produced it. Every Intoxilyzer 8000 in Florida has a paper trail: inspection records, maintenance logs, and control tests that show whether the instrument was working when it tested you. We read that file.
The State leans on the number. We look at the machine’s history, because a result from an instrument with a troubled record is a result worth challenging.
What the Records Have to Show
Florida requires the agency to inspect each breath instrument every month, and the Florida Department of Law Enforcement inspects it at least once a year. Those inspections run control tests with known alcohol standards to confirm the machine reads correctly. Each one generates a record. Missing inspections, late inspections, and failed control tests are all visible in the file, if someone asks for it.
A breath instrument is inspected every month by the agency and once a year by FDLE, each time against known standards. When a control test fails or the machine needs repair near your test date, your result sits on shaky ground, and the full file shows it.
Do not miss this
A breath reading at or above 0.08 also starts the 10-day license clock.
A breath result over the limit triggers an administrative suspension on top of the criminal case. You have 10 days from the arrest to demand a formal review hearing with the DHSMV in Clearwater, which protects your license and can secure a 42-day permit. We file that request the same day you hire us. Call or text (727) 761-4318.
The Numbers Behind a Passing Inspection
“Passed” is not a magic word. Florida’s rules set specific numbers an inspection has to hit, and a file can look clean while missing them. The alcohol-free test has to read 0.000, and any reading above that is improper. The known control solutions are run at 0.05, 0.08, and 0.20, and each result has to land within five percent of its target, which means 0.045 to 0.055, 0.075 to 0.085, and 0.190 to 0.210. The acetone check has to detect and subtract the interferent on each run, and the radio-frequency check has to catch interference and report it. We do not take the agency’s word that the machine passed. We read the numbers against the state’s own guidelines, because a machine can clear an inspector’s signature and still fall outside what the rule requires. A machine that cannot be brought back within tolerance should not be producing evidence against you at all.
What We Request
We pull the full history for the specific instrument that tested you: the agency inspection reports, the annual department inspections, the maintenance and repair records, the dry gas or alcohol standard records, and the machine’s own data logs. We are looking for the gaps, the failures, and the repairs that line up with the time of your test.
The Reference Cylinder Behind the Control Tests
Every control test compares the machine against a known alcohol value, and that value comes from a reference source: a compressed cylinder of a certified alcohol and gas mixture, or an alcohol reference solution. That source carries a lot number and an expiration date, and it has to be both in date and traceable to a certified standard when the test is run. If the cylinder was expired, or its records do not trace back to a valid certification, the control tests that confirmed the machine were measured against something the State cannot fully stand behind.
This is not hypothetical. The expiration date and lot number print on the breath test affidavit itself, right alongside the result. When that date falls before the date of the test, the control tests on which the whole reading depends were run against an expired standard. We check the cylinder lot and expiration on every case and match them to the certification records the State is required to keep.
Why a Machine’s History Matters
An instrument that failed an inspection, needed repair, or drifted out of tolerance near the time of your test casts doubt on your result. If the machine was reading wrong for other people, the question becomes whether it was reading wrong for you. That is a question the records can raise and the State has to answer.
Why This Matters in Your Case
The breath number is presented as the output of a reliable, well-kept instrument. When the records show otherwise, that foundation cracks. We use the machine’s own history to challenge whether the result should be trusted at all. It works hand in hand with reading the breath test printout itself.
The instrument is supposed to be checked on a recurring schedule against known control solutions. Each check produces a record, and a missing or failed one is something the defense can use.
What an Agency Inspection Covers
A proper inspection is more than turning the machine on. It checks the instrument against control solutions of known alcohol concentration to confirm it reads correctly, verifies the safeguards are working, and documents the result. When a control reads outside its expected range, when an inspection is late or skipped, or when a record is incomplete, the assurance that the machine was reading correctly on the day of your test starts to slip. The records are kept by the agency and are discoverable.
Where the Records Fall Short
We compare the inspection history around the date of your test against what the rules require, looking for late inspections, failed or marginal control checks, repairs, and gaps in the paperwork. A machine with a troubled maintenance history is a machine whose number deserves less trust. This pairs with the source code question and the printout, because the records and the data together show whether the instrument was sound when it tested you.
The records are where a breath case is often won, long before trial, and I read them the way the state inspector should have. I check the control solutions against their exact windows, the blank against zero, and your two samples against the agreement rule, because a machine that drifted outside any of those was not a reliable machine on the day it tested you. When the paperwork cannot show the instrument met its own standards, the number it produced has not earned its place in your case, and I say so.
I started out as an Assistant Public Defender in Florida’s Thirteenth Judicial Circuit, in Tampa, and today I am one of six ACS-CHAL Forensic Lawyer-Scientists in Florida, with forensic training in how these instruments work. A breath result is an estimate produced by a machine, and I read its calibration history, its agreement checks, and the assumptions built into the number, so I can show a jury where it does not hold up. Learn more about my background.
Questions About Calibration Records
What records exist for a breath test machine?
Each Intoxilyzer 8000 has monthly agency inspection reports, annual FDLE inspections, maintenance and repair logs, alcohol standard records, and data logs. They show whether the machine was working correctly.
How often is a breath machine inspected in Florida?
The agency inspects it monthly, and the Florida Department of Law Enforcement inspects it at least once a year. Each inspection runs control tests with known standards.
Can a machine’s maintenance history help my case?
Yes. Failed inspections, repairs, or out-of-tolerance results near the time of your test can cast doubt on your result and the reliability of the instrument.
How do I get the calibration records for my breath test?
Your attorney requests them in discovery. We pull the full file for the specific instrument that tested you and review it against the timing of your test.
What is the reference cylinder, and why does it matter?
The reference cylinder holds the known alcohol standard the machine’s control tests are measured against. It carries a lot number and an expiration date. If it was expired or cannot be traced to a valid certification, the control tests that were supposed to confirm the machine are themselves in question.
What do the breath machine’s calibration records have to show?
Under Florida’s rules, the control solutions run at 0.05, 0.08, and 0.20 must each land within plus or minus 5 percent, so within 0.045 to 0.055, 0.075 to 0.085, and 0.190 to 0.210. An alcohol-free test must read 0.000, and your two breath samples must agree within 0.020. A machine can be marked as passing yet still fall outside these windows, which is why the records get checked against the actual numbers.
Related: the main breath test defense page, how we challenge a breath test, and the 20-minute observation period.
This page is general information, not legal advice, and it does not create an attorney-client relationship. Breath testing in Florida is governed by Fla. Stat. 316.1932 and 316.1934 and the Florida Administrative Code chapter 11D-8. Procedures and rules change, and every case turns on its own facts. Past results do not guarantee a similar outcome.
