The problem in our system is that, when the police break the rules and get caught, the only penalty is that the evidence is excluded. "Parallel reconstruction" lets police evade even that tiny penalty for breaking the rules of evidence.

Really, there should be some personal liability for the police when they do something illegal to catch a criminal. That change isn't going to happen.

Also, "Making and selling certain chemicals." is something that shouldn't be illegal in the first place.