Drunk driving is the act of operating a motor vehicle while the operator's ability to do so impaired as a result of alcohol consumption, or with a blood alcohol level in excess of the legal limit. For drivers 21 years or older, driving with a blood alcohol concentration (BAC) of 0.08% or higher is illegal.
Our pupils dilate when we are seeing something stimulating or we are in low light. If we are aroused our pupils dilate in order to take in more of our pleasing surroundings. Often during courtship pupils stay dilated. You can tell when someone is aroused by looking closely at their pupils in constant surrounding light.
Pupil dilation is simply an indication of physiological arousal. The pressure of trying to pass off a lie causes a general stress response in many people, thus leading to adrenaline release, which causes pupil dilation. Hence it sometimes being used as a part of a lie detection protocol. Remember, if someone's pupils are dilated, that doesn't mean they are lying - they could just as easily have knocked down an espresso, be really excited about the topic, or even be afraid that you think they're lying when they're not. Context and other indicators are very important.