We need an app that makes smartphones screech loudly whenever this kind of radiation is detected. If there was a cacophony of annoying noise drawing attention t

We need an app that makes smartphones screech loudly whenever this kind of radiation is detected. If there was a cacophony of annoying noise drawing attention to their actions whenever this is used, they wouldn't use it much. I have little doubt that these are already being secretly used in places that would elicit a WTF from your average citizen. Are there any sensors on a smartphone that might go detectably wonky when hit with this?