Abstract: A method for performing lawful intercept of mobile units in proximity to a target mobile unit is provided. A first mobile unit to target is identified. A geographical area about the first mobile unit is defined. Wireless networks record any other mobile units that enter the geographical area and report these mobile units to a law enforcement agency.

Abstract: A plurality of registration messages are received at a base station from a plurality of mobile units. The base station collects these registration messages for a predetermined period of time. At the end of the predetermined period of time, the base station sends the registration messages, or a summary of the registration messages, to a wireless network. The wireless network examines the registration messages to determine if the number of registration messages received for a predefined geographic area exceeds a predetermined threshold. If so, the wireless network sends a crowd information update message to a law enforcement agency if the plurality of registration message exceed a predetermined threshold.

Abstract: A method for performing video surveillance of a mobile unit in a wireless network is provided. A wireless network receives a surveillance request for a mobile unit. The surveillance request comes from a law enforcement agency and includes the identity of the mobile unit and a geographical area. The wireless network determines that the mobile unit has entered the geographical area and sends the geographical location of the mobile unit from the wireless network to the law enforcement agency.