[JoeSmithson]

No, you don't have an absolute right to know all the details of how an investigation was conducted. You don't necessarily get to see the intelligence that supported a search warrant, for example.

[monocasa]

You do in the US.

[laughinghan]

Even in the US there are exceptions, like the state secrets privilege:

https://www.eff.org/nsa-spying/state-secrets-privilege