[cryoshon]

let's say you need a warrant to get X.

you use illegal methods to get X without a warrant. but you can't use that information legally. so you use your knowledge of X to find a legal way of learning X, after the fact.

then you go to the courts saying you found X the legal way.

but you didn't.

[Chriky]

I understand the theory thanks, I'm just disputing that this scenario is anything other than exceptionally rare. Parallel construction is used to protect sensitive sources, not cover up illegality.