1. A method, comprising: detecting electromagnetic radiation returned from a concealed surface associated with a person, the electromagnetic radiation including one or more frequencies in a range of about 200 MHz to about 1 THz; establishing data corresponding to intensity of the returned electromagnetic radiation along the surface and depth along the surface; and adaptively processing the data to determine if a man-made object suspected to be one or more of contraband or a potential security threat is being carried by the person as a function of the intensity along the surface and the depth along the surface.