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In this Feb. 21, 2017 photo, lifelong ham radio operator and expert tinkerer Tom Thompson poses for  a photo inside his basement home office, where he operates a ham radio and other devices in Boulder, Colo. After discovering that radio interference was being caused by high-powered lights from home marijuana growers, Thompson built an electronic filter and has given them to nearby growers. (AP Photo/Brennan Linsley)

In this Feb. 21, 2017 photo, lifelong ham radio operator and expert tinkerer Tom Thompson poses for a photo inside his basement home office, where he operates a ham radio and other devices in Boulder, Colo. After discovering that radio interference was being caused by high-powered lights from home marijuana growers, Thompson built an electronic filter and has given them to nearby growers. (AP Photo/Brennan Linsley)

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