The Law: Speak, Voiceprint

It was just after midnight on May 22, 1970, when St. Paul police headquarters got an anonymous call asking help for a woman about to give birth. Two policemen sped to the scene but found only a darkened house. While one policeman went round to a back door, a sniper suddenly opened fire from across the street. The second policeman fell mortally wounded.

It seemed a random attack on "police in general," and the only clue was the telephone call, which had been routinely taped. To find a matching voice, police interrogated 13 women...

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