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Line 6: == Use by law enforcement == The distinctive electrical hums have been used to provide forensic verification of audio recordings, a process fully automated in the [[United Kingdom]].<ref>{{cite news\|last1=Morelle\|first1=Rebecca\|title=The hum that helps to fight crime\|url=~~http~~https://www.bbc.co.uk/news/science-environment-20629671\|accessdate=27 January 2017\|date=12 December 2012}}</ref> == References ==

Electrical network frequency analysis: Difference between revisions