What does the term "Illegal Per Se Law" refer to?

The term "Illegal Per Se Law" specifically refers to legislation that makes it illegal to operate a vehicle if a person's blood alcohol concentration (BAC) exceeds a defined legal limit, usually 0.08% in many jurisdictions. This type of law does not require proof of impairment; simply having a BAC at or above the legal limit is sufficient for a DUI (Driving Under the Influence) offense. This is significant as it streamlines the enforcement of DUI laws, focusing on measurable BAC levels rather than subjective assessments of impairment.

The other options do not accurately describe what "Illegal Per Se Law" entails. For instance, while laws pertaining to illegal drug use and regulations for commercial vehicle operation may exist, they do not define the concept of "Illegal Per Se." Additionally, laws permitting DUI checkpoints address enforcement methods rather than the legal standards regarding BAC. Thus, the most accurate description of "Illegal Per Se Law" is that it pertains to the prohibition of driving with a BAC over the established legal limit.