@cicerone imposter,
cicerone imposter wrote:
Let's just pick one; terrorism. If they don't listen to telecommunications or investigate emails, how do they do any investigation?
Okay, let's take this example.
There must be a "Anfangsverdacht" (initial suspicion). The prosecution office orders the criminal investigation department to start investigations.
If the police officers think, they need to listen to to telecommunictions or investigate emails to do so, the prosecution makes a relevant request to the court. The judge gets evidence from the police and gives his ruling (there are a couple of relevant different laws, which I'm NOT going to translate)