Yes. Even when a breath machine produces a reading, there are several potential grounds to challenge that evidence. Challenges may focus on whether the device had up-to-date calibration and maintenance records, whether the operator followed required procedures, whether the machine displayed any error messages, and whether the testing environment or subject’s condition could have affected the result. In Shaw, reviewing device logs and operator documentation can reveal inconsistencies that undermine the reading’s reliability. A careful review of the full testing record is required to evaluate challenge options. If records show lapses in calibration, missing maintenance entries, or procedural deviations, those findings can be presented at an administrative hearing or in court to seek suppression or reduction of the weight given to the breath result. Prompt record requests help secure the necessary documentation.