What blood alcohol concentration indicates impairment in Arizona?

In Arizona, a blood alcohol concentration (BAC) of 0.08% is the legal threshold for determining impairment while operating a motor vehicle. This level is commonly recognized across many states in the U.S. as the point at which an individual is considered impaired for the purposes of driving.

Law enforcement agencies and the judicial system use this standard to enforce laws related to driving under the influence (DUI). At 0.08%, the effects of alcohol can significantly impact an individual's ability to operate a vehicle safely, including impairing judgment, coordination, and reaction times.

The other BAC levels mentioned, such as 0.05% and higher values like 0.10% and 0.12%, do not reflect the legal impairment threshold in Arizona. While lower levels may also indicate some degree of impairment, 0.08% is explicitly the cutoff for DUI offenses in Arizona, making it the correct answer in this context.