In what scenario might an officer determine that a seat belt was not used?

All of the provided scenarios can contribute to an officer determining that a seat belt was not used during a vehicle incident.

Witness testimony can provide direct accounts from people who might have seen the events unfold, offering insights into whether a seat belt was being used by the occupants. This kind of testimony can be critical in situations where physical evidence may be inconclusive.

Evidence of injury patterns plays an important role as well. In crashes, the nature and location of injuries sustained by the vehicle occupants can indicate whether a seat belt was worn. For example, injuries that are consistent with ejection from the vehicle or significant upper body injuries may suggest that a seat belt was not used.

Additionally, dashcam footage can serve as concrete evidence of an incident. If a vehicle's dashcam captures the events leading up to a crash, it may clearly show whether the occupants wore their seat belts or not, including their movements during the collision.

Together, these different pieces of evidence provide a comprehensive approach to assessing seat belt usage in a given scenario, reinforcing the importance of using multiple methods to gather information in law enforcement situations.