A system and method for monitoring individuals using voice print matching to match previously stored unidentified speech samples with known voice prints is disclosed. Voice prints of unidentified individuals are obtained and stored in a central repository for use by authorized agencies or other entities that monitor voice communications, such as, for example, if the conversation being monitored causes the monitor, based on their predetermined alert criteria, to suspect the speakers of illegal activity, such as, for example, terrorism, or otherwise cause the monitor to seek additional information about the speakers. Voice prints of known individuals are taken by authorized agencies based on predetermined criteria. When these known voice prints are being obtained, they are compared to the unidentified voice prints in the database, and if a match is found, the monitor is notified, and put in communication with the agency taking the voice print for further action as appropriate.