The apparatus, which is used with a vehicle, comprises a breath alcohol sensor and a computing device. The computing device is operatively coupled in use to the sensor and the vehicle and configured to record data: which provides information indicative of the likelihood that the vehicle has been operated in circumstances wherein a breath sample has not been delivered to the sensor within a predetermined period preceding the commencement of said operation and associated with the delivery of breath samples to the sensor that contain alcohol in excess of a predetermined threshold.
