Technically speaking, EVERYTHING in your house is giving off some kind of indication that could theoretically be captured and re-assembled.
IMO the only reasonable interpretation is that the 4th Amendment protects you from anything beyond whatever passes for ordinary observation by normal people.
And that's what the supreme court basically said. It's one thing for the police to look in an open window - but quite another for them to scan your home with a thermal imager.
IMO the only reasonable interpretation is that the 4th Amendment protects you from anything beyond whatever passes for ordinary observation by normal people.