Abstract: Intruder detection and interdiction system and method for using the same. An intruder detection system comprises sensor devices, countermeasure devices, and a control unit connected to the sensor and countermeasure devices. Sensor devices include voice recognition components. The system may detect intruders with the sensor devices, query for identification by a verbal response to be checked by the voice recognition components and activate countermeasure devices if there is no response or if the response is not an authorized voice. In further embodiments, the control unit may be connected to a network or a phone line. Further embodiments comprise a transportable alert device connected to the control unit.