But wait, there's more
When I read the headline of this article, I thought "They're talking about taking pictures of you, using your own cellphone, whenever you use it to make a video call, or even by remotely activating it."
Though the article doesn't mention these possibilities, they're still possible, or likely. It's already been revealed lately, that the "intelligence" communities record ALL electronic communications of every sort. They're able to get amazing compliance for their surveillance goals, from governments, communications companies, etc.--and, no doubt, from manufacturers too. It's the old "In Russia, TV watches YOU!" bit.
As for retina scanning from a high-flying surveillance drone, don't count on it--too high up--it will be done from the ground. Though if an individual wants to foil a retina scanner, it's likely that a contact lens could be developed (if it doesn't already exist) that prevents it, while still allowing the user to see through the lens quite well. Though if they detect anyone wearing these contacts, that would probably automatically trigger action for more direct observation.
"It's only a matter of time before they're sampling DNA from pheromones and body odor."
No, there's no DNA in pheromones and body odor, but it might be possible to grab a few skin cells you shed as you walk past a collection/analysis device.