What is the best method to measure one's impairment level?

Using a breathalyzer or evaluating oneself through self-assessment of coordination and judgment is the best method to measure one's impairment level because it provides both objective and subjective measures. A breathalyzer delivers a quantifiable result by measuring the blood alcohol concentration (BAC), which directly indicates if a person is above the legal limit for driving. This is critical since legal limits are set for safety based on extensive research.

Self-assessment, while less reliable, can help individuals gauge their own level of coordination and judgment, which are crucial skills for driving safely. This dual approach encourages responsible decision-making by allowing individuals to consider both empirical data and their own physical capabilities.

In contrast, asking a friend for their opinion on your sobriety relies on subjective judgment that may not provide an accurate assessment, as personal biases and perceptions can influence their evaluation. Driving to assess whether you feel normal risks public safety and can lead to serious legal consequences, as self-perceived sobriety does not account for actual impairment. Monitoring speech may provide some clues about impairment but is not a comprehensive measure, as one can struggle with coordination or cognitive functions without obvious speech issues. Therefore, the recommended method encompasses a more robust assessment of impairment.