The most common cause for a faulty breath test result is police misconduct. The officer who pulls you over and administers the breath test must take several precautions to ensure that the reading is correct. First of all, they must be sure to calibrate the breathalyzer machine every time. These machines are very delicate and, if not calibrated correctly, your BAC could read higher than its true percentage. Even one-hundredth of one percent can make a difference and result in a DUI arrest. At Parks & Braxton, PA, we can thoroughly investigate the circumstances of your arrest and gather evidence to determine whether or not your arresting officer performed their duties correctly and took caution to ensure that the breathalyzer machine was calibrated, that the machine was used correctly, and that your sample was not contaminated.