It is a sight New York drivers probably dread seeing in their rear-view mirror: flashing red and blue lights. Police can either conduct random traffic stops or pull over a driver based on a suspicion that the driver is impaired or drunk while driving. When this happens, the officer usually conducts a three-part field sobriety test to observe the driver's balance, attention level and physical activity.
When someone has been arrested for drunk driving, the evidence may seem incontrovertible at first. After all, the breathalyzer test has been around for decades. It is an easy and reliable way to measure a person’s blood-alcohol concentration. Following arrest, the suspect is typically asked to also take a blood test to confirm the results.