BBC News - The hum that helps to fight crime

A rape victim has come forward to the police. She says she has confronted her attacker and has secretly recorded him admitting his guilt.

A suspected terrorist has been taped planning a deadly attack, and the police want to use this evidence in court. Or someone has been captured on CCTV threatening an assault.

Increasingly, recordings like these are playing a role in criminal investigations.

But how can the police be sure that the audio evidence is genuine, that it has not been tampered with or cleverly edited?

Forensic scientists have come up with the answer: they can authenticate these recordings with the help of a hum.

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