Which of the following would be considered a behavioral clue of DUI?

Fumbling with the driver’s license or paperwork is considered a behavioral clue of DUI because it may indicate a driver’s impairment or lack of coordination, which are common signs of intoxication. Impaired individuals often struggle with motor skills and exhibit clumsiness, making it difficult for them to handle basic tasks, such as retrieving essential documents from their wallet or glove compartment. Observing such behavior during a traffic stop can raise a law enforcement officer's suspicion about the driver's ability to operate the vehicle safely.

In contrast, sharing personal details about life may not necessarily indicate impairment and could simply be a person's communication style. Complaining about traffic laws could stem from various motivations unrelated to impairment, such as frustration or disagreement with law enforcement practices. Demonstrating good verbal communication typically suggests that the person is coherent and aware of their surroundings, which would not be consistent with signs of impairment. Thus, the act of fumbling with paperwork directly correlates with potential intoxication, making it a significant behavioral clue for officers to observe.