What is a common reason for an officer to suspect criminal behavior?

A common reason for an officer to suspect criminal behavior is flight from the scene of a crime. When individuals flee when they are approached by law enforcement or when a crime has occurred nearby, it can indicate consciousness of guilt. This behavior is often interpreted as an attempt to evade accountability or prevent law enforcement from questioning them about their involvement in the incident. The act of fleeing can raise suspicion and prompt further investigation by law enforcement officers, as it deviates from the typical response of a law-abiding citizen who would likely remain to provide information or cooperate with authorities.

The other options do not inherently suggest criminal intent or behavior. For example, having a valid driver's license and a clean criminal record can indicate compliance with the law, while familiarity with a suspect alone does not provide sufficient basis for suspecting criminal activity without additional context.