We present experimental results proving that a Time-Reversal Electromagnetic Chamber allows studying the susceptibility of a device to external radiated interference. The technique here proposed is based on the generation of wavefronts focusing over an arbitrary position in space, leading to a spatial resolution of a half-wavelength. By monitoring the level of energy transmitted through the shielding of the device, it is found that this technique can identify the presence of coupling paths (e.g., slots), their position and orientation. The information thus retrieved is much richer than that yielded by standard EMC tests in anechoic or reverberation chambers, where the position of such coupling paths is not readily accessible.