Methods and apparatus for detecting false alarms are disclosed. An indication may be received that a sensor device has changed state. Data indicative of movement of the sensor device may also be received. Based on the received data indicative of movement of the sensor device, it may be determined whether the movement of the sensor device is abnormal. Based on the changed state of the sensor device and based on determining that the movement of the sensor device is abnormal, an indication of a false alarm may be caused to be output.