A method for reducing violence within crowded venues is provided. The method includes reading license plates of vehicles passing into entry ports of a parking area, and capturing facial images of persons seeking admission to the venue. A computer compares such license plates to a database of vehicle license plates associated with persons with past histories of violence. A computer also compares captured facial images to a database of facial data for persons with past violent histories. Upon detecting a match, the computer creates an alert presented to law enforcement officers to facilitate detention of such persons for investigation. Information recorded on entry tickets is scanned and saved together with the facial image of the ticket holder. If a violent act occurs, cameras within the venue capture facial images of participants. The computer matches such participants to stored identifying data to assist in the identification and apprehension of such persons.