Abstract: A system includes a base station computer with memory for storing a data file representative of vehicle license plate numbers and coded violation information associated with the numbers. A plurality of stand-alone computers are compatible with the base station computer and have separate memory capacity into which the data file may be transferred. Each stand-alone computer is equipped with voice-recognition circuitry for receipt and recognition of voiced communications from an enforcement officer via a hand-held unit. The voiced communication relates to a license plate number observed by the officer on duty. Upon receipt and recognition of a voiced signal by the respective stand-alone computer, the stand-alone computer searches the data file for unpaid violations by the observed number, and if any are detected, the officer is informed so that appropriate enforcement steps may be taken.