Voiceprint, a visual representation of a person's voice used for purposes of identification. A voiceprint is made with a sound spectrograph, a device used to analyze complex sound waves. The voiceprint appears as a pattern of tracings that indicate the moment-by-moment distribution and relative strengths of a voice's component frequencies. The voiceprints of different people speaking the same words generally show patterns unique to each speaker. Unlike fingerprints, however, voiceprints made at different times (of the same person speaking the same words) may show some variation. Voiceprints were first used as evidence in a court of law in 1966.
The media saturates us with stories of violence, but most people leave them on the page or screen. So what made these copycat killers act out?
In the park. On the bus. At the mall. At your job. Is there any place you can go and not be watched? After reading this article, you may agree the answer is "no."