A system comprising a server (300, 400) and a police activity detector; the police activity detector comprising: a receiver (24, 30) for detecting electromagnetic signals generated in the context of police activity, a processor coupled to said receiver (24, 30) and evaluating electromagnetic signals received by said receiver (24, 30) to determine whether a warning is to be issued, and a modem for both receiving and transmitting data, wherein the modem is embedded within the police activity detector and coupled to said processor, wherein the processor is configured: to operate under control of software and/or data, to control a wireless device interface comprising a radio, and to exchange, using the modem, data with the server (300, 400) via a communication network or an Internet communication network, wherein data transmitted to the server (300, 400) include coordinates; and wherein the processor is operable: to receive, via the communication network or the Internet communication network, from the server (300, 400), coordinates of false alert and corresponding indication of false alert designation, and to determine that the warning should not be issued in response to the false alert designation; characterized in that the server is configured: to analyze the coordinates in real-time to determine the coordinates of a false alert and the corresponding indication of false alert designation if the false alert designation at the coordinates has been received a sufficient number of times from different radar detectors; and to transmit the coordinates of the false alert and the corresponding indication of false alert designation. the police activity detector comprising: a receiver (24, 30) for detecting electromagnetic signals generated in the context of police activity, a processor coupled to said receiver (24, 30) and evaluating electromagnetic signals received by said receiver (24, 30) to determine whether a warning is to be issued, and a modem for both receiving and transmitting data, wherein the modem is embedded within the police activity detector and coupled to said processor, wherein the processor is configured: to operate under control of software and/or data, to control a wireless device interface comprising a radio, and to exchange, using the modem, data with the server (300, 400) via a communication network or an Internet communication network, wherein data transmitted to the server (300, 400) include coordinates; and wherein the processor is operable: to receive, via the communication network or the Internet communication network, from the server (300, 400), coordinates of false alert and corresponding indication of false alert designation, and to determine that the warning should not be issued in response to the false alert designation; a receiver (24, 30) for detecting electromagnetic signals generated in the context of police activity, a processor coupled to said receiver (24, 30) and evaluating electromagnetic signals received by said receiver (24, 30) to determine whether a warning is to be issued, and a modem for both receiving and transmitting data, wherein the modem is embedded within the police activity detector and coupled to said processor, wherein the processor is configured: to operate under control of software and/or data, to control a wireless device interface comprising a radio, and to exchange, using the modem, data with the server (300, 400) via a communication network or an Internet communication network, wherein data transmitted to the server (300, 400) include coordinates; and to operate under control of software and/or data, to control a wireless device interface comprising a radio, and to exchange, using the modem, data with the server (300, 400) via a communication network or an Internet communication network, wherein data transmitted to the server (300, 400) include coordinates; and wherein the processor is operable: to receive, via the communication network or the Internet communication network, from the server (300, 400), coordinates of false alert and corresponding indication of false alert designation, and to determine that the warning should not be issued in response to the false alert designation; to receive, via the communication network or the Internet communication network, from the server (300, 400), coordinates of false alert and corresponding indication of false alert designation, and to determine that the warning should not be issued in response to the false alert designation; characterized in that the server is configured: to analyze the coordinates in real-time to determine the coordinates of a false alert and the corresponding indication of false alert designation if the false alert designation at the coordinates has been received a sufficient number of times from different radar detectors; and to transmit the coordinates of the false alert and the corresponding indication of false alert designation. to analyze the coordinates in real-time to determine the coordinates of a false alert and the corresponding indication of false alert designation if the false alert designation at the coordinates has been received a sufficient number of times from different radar detectors; and to transmit the coordinates of the false alert and the corresponding indication of false alert designation.