If your BAL is at .04, what percentage drop in complex performance can be expected compared to the sober level?

Answer: A — 13%

A blood alcohol level (BAL) of 0.04 is relatively low, but even at this level, there can be measurable effects on a person's ability to perform complex tasks. Research indicates that a BAL of 0.04 can result in a decrease in complex performance by approximately 13%. This decline could be attributed to the impairing effects of alcohol on cognitive functions, motor skills, and overall reaction times, which can begin to present themselves at even lower alcohol levels. Understanding the extent of impairment is crucial for recognizing how alcohol affects driving and other complex activities. Awareness of such statistics helps reinforce the importance of remaining within legal limits and understanding that impairment can start before reaching higher levels of intoxication.