What is the best method for verifying a subject's vehicle registration?

The best method for verifying a subject's vehicle registration is through the Vehicle Identification Number (VIN). The VIN is a unique code assigned to every motor vehicle when it's manufactured. This number is used to track the vehicle’s history and is critical for identifying the vehicle's specifications, ownership, and registration details.

When law enforcement officers check vehicle registration, using the VIN ensures accuracy, as it uniquely indicates that specific vehicle. While other identifiers such as the license plate number may also lead to the vehicle's registration, the VIN provides a more precise way to match the vehicle to its registered owner and details, reducing the risk of errors that could arise with similar or duplicate license plate numbers.

Other options, like the driver's license number or insurance policy number, do not directly correspond to the vehicle itself and are not the most efficient means of confirming a vehicle's registration information. Thus, using the VIN remains the most reliable and informative method for verifying registration.