I'm guessing it was a $50 Walmart toy. Why?
Because people on /. love to guess about details when those guesses can be used to ridicule or embarrass someone.
Because it ran out of batteries without warning while over the White House lawn and the owner couldn't reclaim it because of the security fence. Larger drones have battery warnings and some even have GPS-guided return-to-base functions on low battery.
A group I know recently took three quads to a beach to do some scientific research. Bought with limited funds so they aren't just toys, they're tools that need to be used properly and maintained for multiple uses.
Only one came back. Two of them wound up in the ocean.
Low battery return functions only work if they trigger far enough in advance that they can make it back to safety. The one I have (a $500 DJI) has such a function. The last time I flew it to "low battery", it had about enough battery left to make a controlled descent from directly overhead. Even if it had sufficient battery, the return algorithm is to climb to 20' and then fly to home and then descend. There's no sensors in the quad to notice that there's a 30' tree or building betwixt it and home.
Using a micro-quad is no proof-of-concept at all, as it wouldn't be able to carry a sufficient payload,
Except as a proof-of-concept regarding GPS jamming around a sensitive target, or to determine the security response to such an event. Not every 'proof of concept' has to deal exclusively with the specific hardware being tested, it can be a "proof of concept" for the entire process.
(ie a proof of concept that alerts the target to the possibility is no use at all.
I'm sorry, but you're assuming the security around the whitehouse is run by morons who couldn't imagine the use of a simple quad. I'm going to guess that they probably already know about the possibility.
It's as stupid as shining a laser sight through someone's window the day before the assassination attempt, telling the target to hide.
You're assuming that the pre-planned response if someone shines a laser pointer through Potus' window is to have the President of the US hide for the next few days. Somehow I doubt that's the reaction you'd get when you try it. For a bad guy, it would be valuable to know what the response IS to such an event, so that during any potential confusion some other method of attack can be used to accomplish whatever goal is desired.
You know, if you're going to try to do something bad to someone who is well defended, it is important to probe the responses so you can determine weaknesses or what other things you'll have to deal with.
As far as the size of the drone, I recall an episode of one of the recently ubiquitous gun-shop television shows where they designed and built a quad with a gun. It wasn't a huge quad they needed to carry that weight. They were also carrying a lot of extra weight since they were using a stock handgun. Get rid of all the useless stuff, like the stock, the magazine, etc, until you have a simple tube with a firing pin and it would weigh a lot less. A single-use barrel, thermal firing, you could probably get it down to weigh less than a GoPro. You could probably 3-D print the thing as part of the quad's chassis.