The distinction is between legal search (as in the article) and tresspass (as in a neighbour's incursion). The latter is covered by airspace rights: 49 USC 40

The distinction is between legal search (as in the article) and tresspass (as in a neighbour's incursion). The latter is covered by airspace rights: 49 USC 40103, and US v. Causby. <https://www.law.cornell.edu/uscode/text/49/40103 https://www.law.cornell.edu/uscode/text/49/40103> <https://en.wikipedia.org/wiki/United_States_v._Causby https://en.wikipedia.org/wiki/United_States_v._Causby> Those might be limited by harassment or stalking principles.