I absolutely love the way she writes. So colloquial, yet so effective.
For me, a simple analogy clinches this case—and does so on privacy as well as property grounds. A stranger comes to the front door of your home carrying super-highpowered binoculars. See ante, at 7, n. 3. He doesn’t knock or say hello. Instead, he stands on the porch and uses the binoculars to peer through your windows, into your home’s furthest corners. It doesn’t take long (the binoculars are really very fine): In just a couple of minutes, his uncommon behavior allows him to learn details of your life you disclose to no one. Has your “visitor” trespassed on your property, exceeding the license you have granted to members of the public to, say, drop off the mail or distribute campaign flyers? Yes, he has. And has he also invaded your “reasonable expectation of privacy,” by nosing into intimacies you sensibly thought protected from disclosure? Katz v. United States, 389 U. S. 347, 360 (1967) (Harlan, J., concurring). Yes, of course, he has done that too.
That case is this case in every way that matters. Here, police officers came to Joelis Jardines’ door with a supersensitive instrument, which they deployed to detect things inside that they could not perceive unassisted. The equipment they used was animal, not mineral. But contra the dissent, see post, at 2 (opinion of ALITO, J.) (noting the ubiquity of dogs in American households), that is of no significance in determining whether a search occurred. Detective Bartelt’s dog was not your neighbor’s pet, come to your porch on a leisurely stroll. As this Court discussed earlier this Term, drug-detection dogs are highly trained tools of law enforcement, geared to respond in distinctive ways to specific scents so as to convey clear and reliable information to their human partners. See Florida v. Harris, 568 U. S. ___ (2013) (slip op. at 2–3, 7–8). They are to the poodle down the street as high-powered binoculars are to a piece of plain glass. Like the binoculars, a drug-detection dog is a specialized device for discovering objects not in plain view (or plain smell). And as in the hypothetical above, that device was aimed here at a home—the most private and inviolate (or so we expect) of all the places and things the Fourth Amendment protects. Was this activity a trespass? Yes, as the Court holds today. Was it also an invasion of privacy? Yes, that as well.