Never mind the nukes, I am worried more about the terrorist groups practicing dropping bad stuff with drones. For example, drones armed with some sort of accelerant, coasting innocently over forested or brushy areas, deliberately crashing the drones, with result of the crash setting fires over tinder dry areas of north America. Or drones rigged to spread poison over water bodies used for drinking water or drones bombing electrical transmission stations....wait a minute! what am I worried about? Obama is on the job....