Yes, breathalyzer results can be challenged on multiple grounds including improper calibration, operator error, maintenance failures, or defective equipment. The National Highway Traffic Safety Administration establishes strict standards for breathalyzer operation and maintenance. Many devices contain known defects affecting accuracy, and some operators lack proper training or certification. We obtain breathalyzer maintenance records, certification documents, and operator training files. We consult toxicologists who identify specific defects affecting your test. We cross-examine the testing officer regarding procedures followed and equipment condition. Successful challenges often result in test exclusion and significantly weakened prosecution cases.