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Electronic devices emit unintended radiations as a result of numerous transmission lines printed on circuit board various connectors active and passive devices impact are mismatch amongst these packaging and many other factors. Detection of passive radio frequency (RF) receivers due to their unintentional emissions at a significantly low level is challenging in high level of noise in urban environment that may contain stronger emission sources besides the interval noise of the receiver (Rx). A spying device may consist of both transmit and receive systems. When a signal is being radiated it is easy to detect however such devices might consist of receivers only, which have some storage capacity and the information can be extracted from these later on and analyzed. These receivers which are working in passive mode are difficult to detect. This project explores the efficiency of various methods used to detect such passive receivers. The receivers can be detected passively by receiving their unintentional emissions or actively by impinging an electromagnetic (EM) radiation on it and causing the device to re-radiate these as a result of the incident signal and then detecting those radiations and identifying them.