There are many actions you could take to mess with the investigation that might seem like fair game, but you should discuss each one with an attorney so you don't provide some arcane justification for them to arrest you (by hacking back, or even maybe "interfering with an investigation").
Once you get past that stage, the attorney can help you petition to stop the behavior or demand more information about it.
Legal advice is what you need now, not tech advice.
(Because the server is crushed, I'm only getting the basic gist - forgive me if you've already done this.)