Drunk driving in the United States

"Drunk driving" is the act of operating or driving a motor vehicle while under the influence of alcohol or drugs to the degree that mental and motor skills are "impaired". It is illegal in all jurisdictions within the United States, though enforcement varies widely between and within states/territories, to drive a motor vehicle while impaired or with a breath or blood alcohol concentration of 0.08% or greater if over the age of 21.