What is the standard for traffic police breathalyzer tests?
2 Answers
A breathalyzer test showing alcohol content between 20mg/100ml (inclusive) and below 80mg/100ml is classified as drinking (driving under such condition constitutes drunk driving), while 80mg/100ml or above is considered intoxication (operating a motor vehicle in this state constitutes drunk driving). Alcohol consumption significantly impacts driving ability in two key aspects: 1. Visual impairment: Normally, people have a peripheral vision of about 180 degrees. With alcohol levels exceeding 0.08%, the driver's field of vision narrows substantially, rendering them incapable of safe driving. Severely intoxicated drivers may only perceive a very limited portion of their surroundings. 2. Delayed motor reflexes: Reaction times slow by 1-2 seconds. At 60km/h, this means the vehicle travels 16.67 meters per second, which can lead to severe consequences.
On the front lines of law enforcement, the standard operation of breathalyzers is crucial. We require drivers to take a deep breath and then blow steadily into the device for 5 to 8 seconds to ensure a consistent airflow. The standard for breath alcohol concentration is no more than 20 milligrams per 100 milliliters of blood equivalent—exceeding this threshold constitutes drunk driving, while levels above 80 milligrams qualify as severe drunk driving. In practice, traffic police calibrate the device on-site to eliminate interference factors, such as food residue in the mouth that could lead to false readings. Test results are displayed immediately on the screen, enabling rapid decision-making: if the reading is within limits, the driver is cleared; if exceeded, further action or penalties are required. This standard is derived from long-term accident statistics, helping to screen high-risk behaviors and reduce nighttime collisions. Remember, regular maintenance of the device is also essential, as aging components can affect accuracy—law enforcement must ensure fairness and efficiency.
