How is a DUI arrest typically substantiated in a court of law?

A DUI arrest is typically substantiated in a court of law by presenting a combination of observations, SFST (Standardized Field Sobriety Testing) results, and chemical test data. This comprehensive approach is crucial because it provides a well-rounded view of the circumstances surrounding the arrest, including the officer's observations of the driver's behavior, performance on field sobriety tests, and results from any chemical tests that measure blood alcohol concentration (BAC).

Field observations may include signs of impairment, such as erratic driving, an odor of alcohol, or slurred speech. SFST results provide objective measures of a driver’s physical and cognitive abilities under the influence, while chemical test data offers definitive proof of a driver’s BAC, supporting claims of impairment. Together, these components create a robust case that can withstand legal scrutiny, as they combine subjective observations with objective, quantifiable evidence. This is essential in DUI cases, where proving impairment beyond a reasonable doubt is necessary for a conviction.