North Carolina state law prohibits individuals from operating a motor vehicle while under the influence of alcohol, as defined by applicable statutes. Police have various ways of enforcing the state's DUI laws. Typically, though, a drunk driving arrest will occur after a police officer witnesses driver operating his or her motor vehicle in a way that makes the driver appear inebriated.
After conducting the DUI traffic stop, a police officer typically subjects the driver to a series of tests -- usually a Breathalyzer test and multiple field sobriety tests. The Breathalyzer test measures the amount of alcohol in a driver's blood stream. If the test results show that the driver has blood alcohol levels of .8 percent or above, then the driver can be arrested and charged with DUI.