Go outside after dark on a clear quiet evening. If you have a good view of the nighttime sky, and live near a metropolitan area, just sit and watch. Sooner or later, you'll probably observe something moving through the air that doesn't resemble an airplane or helicopter, makes no noise, at least loud enough for you to hear, and will occasionally stop, reverse course, fly in a circle, etc. My son and I have observed one of these a few times in the past year or so. It has a continuously illuminated red light on it. No doubt in my mind it is a drone being flown by some agency.
The last time we observed one of these things was back in June. We watched it flying south after crossing over I-40 and it continued flying south towards the city of High Point.