Electrical Grid Hum Used To Time Locate Any Digital Recording

As with so many of these forensic tests, what this test can unambiguously be used for is to prove that a recording _HAS_ been tampered with.

If there is no hum, or it appears to be correct then the most you can say is "it might be a genuine recording made at the appropriate time" but if there is hum, and it's obviously discontinuous then you can categorically state that the recording has been tampered with.

Unfortunately, most people, including prosecutors, defence, juries, judges, politicians etc, do not und

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/hyXxxiPinv8/story01.htm

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