Electricity supply has unique hum that allows police to timestamp any audio recording [#timing]

Police Can Timestamp Any Audio Recording From Background Interference Alone "the forensic researchers have observed that the frequency of the hum actually changes subtly over time, with fluctuations of a few thousandths of a hertz. That’s a result of supply and demand: when loads are higher, the frequency drops just a little. Interestingly, the way [...]

Source: http://www.richardbanks.com/trends/2012/12/17/electricity-supply-has-unique-hum-that-allows-police-to-timestamp-any-audio-recording-timing/

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