犯罪现场分析人员是怎样收集和保留指纹的
How Crime Scene Analysts Collect and Preserve Fingerprints
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2019-11-13 11:25
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In the fictions of Mark Twain and CSI and more, the identification of fingerprints is one of the most well-known methods for solving crimes. In real life, collecting fingerprints left on a window or doorknob is a delicate science, as well as an important one. Preserving fingerprints can help definitively link a person to a crime, especially since the US government maintains biometric databases of prints from millions of people—including previously convicted and suspected criminals, government employees, military personnel, and others.

在马克·吐温的小说,和CSI等,指纹识别是最被大众所知的破案方法之一。在现实生活中,收集留在窗户或门把手上的指纹是一门精密而重要的科学。保留指纹可以帮助明确地将犯罪和人连接在一起,尤其自从美国政府维护着数百万人的生物指纹数据库---其中包括先前被定罪和有嫌疑的罪犯,政府雇员,军事人员和其他人员。

To learn more about the science of fingerprint collection, WIRED you/tube.com/watch?v=OONfQcGd-uE">caught up with Matthew Steiner, a certified senior crime-scene analyst with more than 20 years of experience. He demonstrated how to lift fingerprints off different surfaces, so they can be viewed under a microscope.

要了解有关指纹收集科学的更多信息,联网you / tube.com / watch?v = OONfQcGd-uE“>联系Matthew Steiner,一位持证并拥有超过20年经验的高级犯罪现场分析师。他将介绍如何从不同的表面提取指纹,以便可以在显微镜下查看。

“The first thing we want to consider is the surface itself,” Steiner says. “The most ideal surface for fingerprints is something that’s smooth and nonporous,” like plexiglass. Steiner uses a special white powder to gently dust fingerprints, making them visible to the human eye. Tape is then placed over the powder, to lift prints off the surface and preserve them for later analysis.

“我们首先要考虑事情是表面的本身” Steiner说。 “对于提取指纹来说,最理想的表面是光滑无孔的”就像有机玻璃。Steiner使用特殊的白色粉末轻轻地扫除指纹上的灰尘,让他们肉眼可见。然后将胶带放在粉末上,以将指印从表面上提取并保存起来用于后续分析。

But what if fingerprints are on a surface that isn’t flat, like a door's handle? In those cases, Steiner makes a silicone cast of the item, which is then sent to a lab. Steiner can even lift fingerprints from items that have been rained on. “Fingerprints are comprised mostly of water,” he says, but also a small percentage of minerals, salts, amino acids, and lipids. If an object has gotten wet, Steiner can spray it with a special black fingerprint detection chemical. It reacts with the remaining oils, rendering the print visible.

但是,如果指纹在不平坦的表面上怎么办,如门把手?这种情况下,斯坦纳会用该产品制成硅树脂铸件,然后将其送到实验室。 Steiner甚至可以从下雨的物品上取下指纹。他说:“指纹主要由水组成。”但也有少量的矿物质,盐,氨基酸和脂质。如果物体弄湿了,Steiner可以用一种特殊的黑色指纹检测化学品喷洒它。它与剩余的油发生反应,使打印件可见。

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