Texas Court Throws 2nd, 4th Amendments Under The Bus

[Kazuaki Shimazaki II]

Originally Posted by GoldenRivet

the fact is: When serving a warrant, the police have to knock and announce... UNLESS there is the possibility of threat to the police, or there is the risk that evidence sought in the warrant may be destroyed

That already seems like a dangerous amount of discretion given to the police. What stops them from using their discretion to rule every time there is a threat?