No, that’s not how it works at all. You use illegally gained information to find other avenues to get evidence that on the surface look ok.
For example, you use illegally gained access to messages to find out about a meeting at a particular time. Then when the meeting to exchange contraband is happening, “a concerned anonymous citizen” calls in a tip of suspicious behavior and a patrol cop stumbled onto a bust.
For example, you use illegally gained access to messages to find out about a meeting at a particular time. Then when the meeting to exchange contraband is happening, “a concerned anonymous citizen” calls in a tip of suspicious behavior and a patrol cop stumbled onto a bust.