just saw this part and couldnt resist as I am a law student.

some jurisdictions accept hearsay as evidence mostly civil ones, the problem however lies in getting the evidence, especially if it is from such a powerful society as the Watchers are. You can send an international request for evidence but the local courts are the ones that will have to carry it out so in many cases it can be denied and though criminal cases are a little different than what I usually study it would be incredibly hard to get any access to the records