According to the original research, the Walk-and-Turn test can determine a suspect's BAC is above or below 0.10 what percent of the time?

The Walk-and-Turn test was designed to assess a person's physical and cognitive abilities to determine potential impairment due to alcohol consumption. According to original research, this test can effectively indicate whether a suspect's blood alcohol concentration (BAC) is above or below 0.10 with an accuracy rate of approximately 68%. This level of reliability is crucial in the context of impaired driving enforcement, as it helps officers make informed decisions during field sobriety testing. Understanding this accuracy contributes to the ongoing discussions around standard performance measures for sobriety tests and their legal implications.