It's a called integrity and morality. Clearly another thing cops and their sycophants don't have.
- The fourth amendment (protection against unreasonable search and seizure)
- Mapp v. Ohio, 1961 (evidence gained without adhering to the fourth amendment is inadmissible)
- Wong Sun v. United States, 1963 (conclusions drawn from unlawfully obtained evidence/illegal entry can be challenged or outright discarded)
- Franks v. Delaware, 1978 (the right to challenge evidence collected on the basis of a warrant granted on the basis of a false statement)
However, in Carpenter v. United States, government entities were found to be in violation of the fourth when accessing historical CSLI records containing the physical locations of cellphones without a search warrant (at least over a period of 7 days or more, if I understood it right). Previously, it was considered fair game under the basis of records technically turned over to a 3rd party.
Then there's United States v. Jones (2012), where it was established a GPS tracking device was attached to a car constitutes a search.
It remains to be seen how Flock will ultimately hold up in court. Although a few cases have popped up, I think it's too early to tell.