It is an open secret long shared by prosecutors, defense lawyers and judges that perjury is widespread among law enforcement officers," though it's difficult to detect in specific cases, said Alex Kozinski, a federal appeals-court judge, in the 1990s. That's because the exclusionary rule "sets up a great incentive for...police to lie."
[Judge Kozinski might have some bias against law enforcement, having recently been the target of accusations he posted porn on his personal website. Details.]
Yeah, they lost another case before SCOTUS recently -- unanimously. Some evidence that the 9th Circuit might still be out of step with mainstream legal thinking.