What must an officer do after determining the speed of a violator's vehicle?

After determining the speed of a violator's vehicle, the officer should verify the speedometer of the patrol vehicle. This step is crucial because it ensures the accuracy of the speed reading obtained from the radar device. A proper and functioning speedometer is necessary not only for the credibility of the speed measurement but also to support the officer’s actions in case of a dispute about the citation.

Verifying the speedometer helps eliminate any doubts regarding the measurement taken and provides a secondary means of corroborating the speed that the radar device reported. Ensuring that the patrol vehicle's speedometer is accurate reinforces the officer's reliability and adherence to procedure in traffic enforcement situations.