[quote=@TheUnknowable]
[@RumikoOhara]So, I need to bring in the grieving widow of the man the Joker murdered if I want her help finding him or evidence of his crime.
[/quote]

Not really, if you wanted to know how he did his crime or to watch him commit his crime just dial 1-888-W.I.T.N.E.S.S. and you will be connected with Trinity Investigations & Special Services. You may talk to Trinity herself or one of her Temp secretaries who will use a question list written up by the boss. If your crime is against a normal by a super then you go to the front of the list. 

The personal approach works well with Trinity if you can prove your need.

She also translates Languages Written or Spoken for a fee