A method of detecting an object of interest at a person to be scanned by using a security scanner system, wherein a millimeter wave scanner located in at least one panel scans the person in a scan volume, thereby providing scanner data, wherein at least one sensor in addition to the millimeter wave scanner scans the person, thereby providing sensor data, wherein the at least one sensor is located in a platform with a standing surface for the person to be scanned which is substantially perpendicular to an extension direction of the at least one panel, wherein the at least one sensor faces with regard to its detection field the scan volume so as to sense the scan volume from below, wherein the scanner data and the sensor data are processed by an evaluation circuit that is connected with the millimeter wave scanner and the at least one sensor, wherein the evaluation circuit evaluates the scanner data and the sensor data during an evaluation process, wherein the evaluation circuit applies at least one predefined criterion on the scanner data and/or the sensor data at least partly to verify whether an alarm is set, and wherein an alarm device connected with the evaluation circuit outputs an alarm in case the evaluation circuit set the alarm during the evaluation process.