A method and system for efficiently screening for threatening items are presented. The system includes a test unit configured to subject the object to a combination of two or more different types of tests, sensors configured to receive test outcome from the object and generate corresponding output signals, and a computation unit receiving and processing the output signals to generate parameter values. The computation unit combines the parameter values from the different types of tests to determine a set of risk factors that indicate a likelihood that the threatening item is present in the object, wherein the parameter values include visualization data obtained from different measurement angles.