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.
With each new crime that pops up, another method of detection is developed; and with each new crime that pops up, another means of protecting yourself comes to light. Learn about various crimes and the available means of detection, protection, and punishment.
There are people willing to sneak grimy, dirty classified files and documents from under lock and key and into the disinfecting power of sunlight. Here are 10 people who went public with stories of hidden corruption.