Quick answer: Breath test results are challenged through machine records — calibration, maintenance, and error logs — plus the 15-minute observation requirement, mouth-alcohol contamination, rising-BAC timing, and the operator’s certification. A breath number is an estimate, and estimates can be wrong.
This video breaks down the anatomy of a breath-test defense: subpoenaing the instrument’s maintenance and error history, examining whether the observation period was actually followed, and exposing the physiological assumptions the machine makes about every person who blows into it.
It also explains rising-BAC: your alcohol level at the time of testing can be higher than when you were driving — and only the driving number matters legally.
Related reading: How do you fight a DWI breath test?-Video
Contact Stephen T. Bowling, DWI & Criminal Defense Attorneys for a free consultation — we answer these questions about your specific case, at no cost and no obligation.
