In other words, people can still freak out over "cancer!" but it's just from the non-stop onslaught of harmless wifi and cell and radio and satellite frequencie

In other words, people can still freak out over "cancer!" but it's just from the non-stop onslaught of harmless wifi and cell and radio and satellite frequencies that penetrate some and reflect some. Plus probably some infrared for the "emitted by the person" bit specifically. Passive signal analysis can be very revealing.