What type of evidence does a chemical test result provide in a Per Se offense?

In a Per Se offense, a chemical test result provides conclusive evidence of a driver's blood alcohol concentration (BAC) exceeding the legal limit. This type of evidence is defined by laws that establish specific thresholds for impairment, often set at 0.08% BAC in many jurisdictions. When the chemical test result indicates that the BAC is above this threshold, it serves as definitive proof of the violation, leading to the presumption of intoxication without the need for additional evidence or observations of impairment.

In contrast, other types of evidence such as inconclusive, corroborative, or presumptive do not hold the same weight in a Per Se context. Inconclusive evidence would imply that the results do not provide a clear indication of intoxication. Corroborative evidence supports or strengthens other evidence but is not definitive on its own. Presumptive evidence suggests a likely conclusion but leaves room for doubt or requires further substantiation. Therefore, the conclusive nature of the chemical test result is what establishes its primacy in a Per Se offense, making it a crucial component in DUI enforcement.