Electrical network frequency analysis

The UK Metropolitan Police has been recording the frequency variations on the National Grid every second and a half for the past five years. When examining recordings, scientists are able to match the variations in the recordings with the database and establish exactly when the recording was made. If there are multiple matches, the recording was edited, and scientists can find out when. The process takes about 10 minutes.

via Met lab claims ‘biggest breakthrough since Watergate’ • The Register.

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