But even given the Supreme Court's finding that Alexis raised, it's unclear whether this stranger's drone-flight -- not to mention his photography -- was legal under current law. John Villasenor, author of a recent Harvard Journal of Law and Public Policy article about the laws governing drones and privacy, explained to me over email that it's difficult to analyze the legalities of the case without more information. What kind of drone was it? How was it flown? These questions would be instrumental to determining whether it was operated in accordance with FAA regulations.

As for the privacy concerns, one of the most important questions is what was being photographed. "If the camera on the drone was always aimed at the public street," Villasenor writes, "then that's very different than if it was capturing images into the home through the window."

The First Amendment provides a right to gather information, but that right is not unbounded; it ends, Villasenor writes, "when it crosses into an invasion of privacy." He continued, "Putting a stepladder up against someone else's home without permission, climbing up the ladder, and then photographing into a second-floor window would be an invasion of privacy. Using a drone just outside the window to obtain those same photographs would be just as much an invasion of privacy."

New technologies may present new ways of violating people's privacy, but that doesn't mean they're legal. It will take courts years to figure out how to apply our laws to our age of drones (and years for legislators to revise them -- they're not, after all, perfect), but we're not starting from scratch. That said, police (or other law-enforcement agents) will need to actually enforce existing laws, or they're not all that helpful.