Topic: Electrical Network Frequency

A new forensic technique called Electrical Network Frequency (ENF) analysis is being used in the UK to verify the authenticity of audio and video recordings. By matching the subtle fluctuations in the power grid recorded in the background of a file against a database of grid activity, investigators can determine the exact time and location of a recording. The hosts dismiss the technology as "pseudo-science" likely to be featured in police procedural dramas like CSI.