Radar Makes All Houses Glass
穿墙雷达看穿一切
Law enforcement agencies have handheld radar that can “see” through walls via RF signals, raising Fourth Amendment concerns. Larry Greenemeier reports
手持雷达可以看穿墙壁，这可帮了警察的大忙，不过别高兴得太早，它似乎违反了第四修正案。
撰文/播音 拉里•格林迈耶
翻译 李轩
Doppler radar has been a weather forecaster’s best friend for decades. But more recently law enforcement has found another application. For the past two years the FBI, U.S. Marshals and other agencies have used a handheld Doppler radar machine to conduct surveillance through solid walls. That’s according to USA Today.
几十年来，多普勒雷达一直是预报天气的好帮手。不过，最近执法机构发现了它另有用处。《今日美国》报道说，在过去的两年中，FBI、美国警察和一些其他机构已经开始利用手持的多普勒雷达穿透墙壁进行监视。
Called the Range-R, this Doppler device sends radio frequency signals through concrete, wood and other nonmetal building materials and can measure the distance between itself and any moving objects on the other side. The Range-R can detect even subtle motion like breathing, although it can’t yet identify whether the respiration is coming from a person or their pet. Some 200 of the $6,000 devices have been sold.
一款被称为Range-R的多普勒雷达发射的射频信号可以穿透墙壁或者其他非金属建材，从而可以测量墙内的移动物体与设备间的距离。Range-R甚至可以探测到呼吸这种微运动，不过它还不能分辨出到底是人在呼吸还是宠物在呼吸。此设备价值6000美元，目前已生产了大约200台。
The problem is that law enforcement has used the Range-R sort of “under the radar,” if you will, sometimes employing it without a search warrant. The issue was brought to light in a court case after the device helped U.S. Marshals catch a parole violator at a house in Wichita. Federal appeals court judges were not pleased.
于是问题来了，执法机构有时可以很“低调”地使用Range-R而不需要搜查证。当这个设备协助警方在威奇托的一所房子中抓住了一名违反假释条件的人后，这个问题终于在法庭现于天日，而联邦上诉法院法官对这种不光彩的做法并不支持。
So that’s the current situation: police use of the technology to gain an edge versus concerns about violations of Fourth Amendment protections against unreasonable searches. Stay tuned for the developing legal decisions regarding this particular Doppler effect.
所以，目前的情况是：警方使用的技术很有可能违反了第四修正案中对不合理搜查的保护。此“多普勒效应”的最终结果，还需进一步确认。
（题图来源：range-r.com）
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