The officers are lying to the court about how the case was built. That is often relevant to a defense (https://en.wikipedia.org/wiki/Fruit_of_the_poisonous_tre

The officers are lying to the court about how the case was built. That is often relevant to a defense (https://en.wikipedia.org/wiki/Fruit_of_the_poisonous_tree https://en.wikipedia.org/wiki/Fruit_of_the_poisonous_tree) and they are lying in this way specifically to deprive defendants of the ability to challenge the collection of that evidence. Intentionally and materially lying to the court is clearly perjury.