System and method for non-contact acquisition of current physiological data representing a subject. A first electromagnetic wave representing current physiological status of a first subject is modified by a second electromagnetic wave representing current physiological status of a second subject in proximity to the first subject. A parameter of the first electromagnetic wave representing a first physiological status of a first subject is measured with electronic circuitry to extract a parameter of the second electromagnetic wave. Historical physiological data associated with the second subject is acquired. The current physiological data representing current physiological status of the second subject is then derived based on historical physiological data of the second subject and a comparison between the first and second parameters.