Laws prohibiting driving under the influence of alcohol (DUI) in New Hampshire and other states are based on research indicating that a person’s ability to drive a motor vehicle safely decreases as their blood alcohol concentration (BAC) increases. The â€œper seâ€ BAC limit in New Hampshire is 0.08 percent, but even if a driver’s BAC is lower than this, he or she may be arrested on suspicion of driving while intoxicated, or when one’s ability is impaired (DWI).
How does driving ability decrease as BAC increases? The U.S. Centers for Disease Control and Prevention (CDC) offers an overview:
- 0.02 percent. Some decrease in ability to track moving objects and to multitask, a key skill when driving.