Which of these would be a common characteristic of someone under the influence?

Impaired motor skills is a well-documented characteristic of individuals under the influence of alcohol or drugs. When someone is intoxicated, their ability to control their movements typically diminishes, leading to reduced coordination, slower reaction times, and difficulties in performing tasks that require fine motor skills. This impairment can manifest in various ways, such as struggling to walk straight, difficulty in maintaining balance, or challenges in operating a vehicle safely. These physical changes can significantly increase the risk of accidents and are often used as indicators during DUI traffic stops to assess a driver's condition.

In contrast, enhanced reflexes, improved judgment, and focused behavior are not typically associated with intoxication. Instead, these traits might be more characteristic of someone who is sober and alert, emphasizing the negative impact that substances can have on cognitive and motor functions.