Which observation might indicate that a vehicle has been involved in illicit activities?

Unusual modifications to a vehicle's structure can be a strong indicator that the vehicle has been involved in illicit activities. These modifications may include altered exhaust systems, hidden compartments, or changes to the engine and suspension that are not typical for a standard vehicle. Such changes can suggest that the vehicle has been customized for specific unlawful purposes, such as smuggling contraband or evading law enforcement.

These modifications can also potentially hide illegal substances or provide improved performance for illegal pursuits, making them a significant red flag for law enforcement. Observing these types of alterations often prompts further investigation into the vehicle and its occupants, as they deviate from expected norms and could indicate an intent to engage in criminal activity.