> They're allowed to lie to suspects, not the courts where parallel construction happens.
That's only true in theory. In practice, police lies are one of the pillars of the US "justice" system.
https://en.wikipedia.org/wiki/Police_perjury
https://www.nytimes.com/2018/03/18/nyregion/testilying-polic...
https://slate.com/news-and-politics/2020/08/police-testilyin...