In Nevada if your blood alcohol content is .08 or higher you are considered drunk and not authorized to drive. NRS 484.379 states it is against the law to drive drunk.
In Nevada pursuant to NRS 394C.110 it is against the law to drink any alcoholic beverage while controlling a motor vehicle. However, if your blood alcohol content (BAC) is less than .08 you may still be charged with driving impaired and under the influence of alcohol. Mind you, driving under the influence (DUI) is not limited to only alcohol. You could be charged with a DUI if you are under the influence of illegal or prescription drugs.
If you are not driving a vehicle but “in charge of a vehicle” you may be convicted of a DUI.
For instance, if the car is turned off but your keys are in the ignition and you are sitting in the vehicle that is considered “in charge” and could be charged with a DUI.