2026年2月17日 / 美国东部时间晚上10:38 / CBS新闻
在搜寻南希·格思里的行动进入第三周之际，调查人员正使用一种名为”信号嗅探器”的追踪设备，该设备能够探测电子设备发出的信号。
曾是国家安全局黑客、并发明此次调查中使用的信号嗅探器的大卫·肯尼迪向CBS新闻表示，由于格思里的心脏起搏器与她手机上的应用程序断开连接，这表明该设备配备了低功耗蓝牙（Bluetooth Low Energy）技术，这种电源设置旨在使设备能持续使用多年。
84岁的南希·格思里是《今日》节目联合主持人萨凡纳·格思里的母亲。据报道，她于2月1日未去教堂而失踪，此前她在亚利桑那州图森市的家中半夜突然消失，疑似被绑架。当局表示，格思里的心脏起搏器于凌晨2:28从她手机上的起搏器应用程序断开连接。
肯尼迪称，低功耗蓝牙的作用半径仅为10至15英尺，但通过信号放大器和高增益天线，其半径可扩展到几百英尺。
他表示，在自己家中使用一架非商用无人机并利用现成物品对其进行改装后，他成功将设备的探测范围扩大到约800英尺。
“通过放大功能，以及部署无人机或利用直升机等方式，他们应该能够覆盖更大的区域，然后真正将范围缩小到几米内，精确定位信号源本身，”肯尼迪向CBS新闻透露。
肯尼迪称，由于起搏器每2至3分钟会发出一次蓝牙信号，信号嗅探器可以捕捉到其位置，执法部门能够通过南希·格思里的手机查看并追踪该位置。
执法部门消息人士向CBS新闻透露，该追踪工具于周一被安装在一架直升机上。消息人士称，携带该设备的直升机正在调查人员仍希望找到格思里的区域上空低空缓慢飞行。
肯尼迪认为，直升机被用作快速过渡手段，以获取大致位置，了解该区域的情况。他表示，信号嗅探器可以安装在无人机或汽车上，不过无人机更高效，因为它能更快地覆盖更远的距离，而使用直升机或汽车可能会因金属建筑或混凝土墙而干扰信号。
由于信号嗅探器对执法部门而言仍是一项新能力，肯尼迪称官员们没有大规模使用无人机，建立相应的基础设施还需要时间。他表示，如果有大约50至60架无人机覆盖300至800英尺的范围，将能加快搜寻进程。
“你确实可以大幅缩短整个过程的时间，大概来说，原本需要120英尺-英里半径范围内搜寻可能需要一天、几天或最多两周才能确定位置，现在借助这些技术，时间会大大缩短，”肯尼迪说，”这实际上取决于人力、无人机操作员以及无人机技术本身。”
乔纳森·维格洛蒂和帕特·米尔顿对此报道有贡献。
https://www.cbsnews.com/video/pacemaker-signal-detectors-inventor-discusses-its-use-in-the-nancy-guthrie-search/
How “signal sniffer” technology is being used in the search for Nancy Guthrie
February 17, 2026 / 10:38 PM EST / CBS News
Investigators are using a tracking device called a “signal sniffer” that can detect signals emitted from electronic devices as the search for Nancy Guthrie continues in its third week.
David Kennedy, a former NSA hacker and inventor of the signal sniffer being used in the investigation, told CBS News that because Guthrie’s pacemaker was disconnected from the app on her phone, it indicates the device is equipped with Bluetooth Low Energy technology, a power setting designed so the device will last multiple years.
Nancy Guthrie, the 84-year-old mother of “Today” show co-host Savannah Guthrie, was reported missing when she failed to show up for church on Feb. 1, after vanishing in the middle of the night from her home in Tucson, Arizona, in an apparent abduction. Authorities said Guthrie’s pacemaker was disconnected from the pacemaker app on her cellphone at 2:28 a.m.
Kennedy said Bluetooth Low Energy only has a 10- to 15-foot radius, but with signal amplifiers and high-gain antennas, the radius can extend to several hundred feet.
He said after conducting a test at his home using a non-commercial drone and off-the-shelf items to modify it, he was able to extend the device’s detection range to about 800 feet.
“With amplification, with the ability to deploy things like drones or leveraging helicopters, they should be able to cover a lot larger area and then really home in just from a few meters to the actual signal itself,” Kennedy told CBS News.
Since the pacemaker sends out a Bluetooth signal every two to three minutes, the signal sniffer can pick up its location, Kennedy said, which law enforcement would be able to view and trace using Nancy Guthrie’s phone.
The tracking tool was mounted on a helicopter on Monday, law enforcement sources told CBS News. The helicopter carrying the device was flying slowly at a low altitude over the area where investigators are still hoping to find Guthrie, the sources said.
Kennedy said he believes the helicopter was used as a quick stopgap to get a general location to see what was happening in the area. He said a signal sniffer could be fixed to a drone or a car, though a drone is more efficient because it can cover greater distances faster, and that using a helicopter or car could interfere with the signal due to metal buildings or concrete walls.
Since signal sniffers are considered a new capability for law enforcement, Kennedy said officials don’t have massive fleets of drones being used, and that it will take time to build out the infrastructure to do so. He said if there were around 50 to 60 drones covering 300 to 800 feet, it would speed up the process.
“You can really cut that time down pretty substantially across the board, you’re probably talking, a day or a few days or a maximum of two weeks of being able to cover 120-foot-mile radius, to be able to actually identify it,” Kennedy said. “It really comes down to manpower, drone operators [and] the drone technology itself.”
Jonathan Vigliotti and Pat Milton contributed to this report.
https://www.cbsnews.com/video/pacemaker-signal-detectors-inventor-discusses-its-use-in-the-nancy-guthrie-search/
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