Your answers to this and other comments are very good. You give the impression that you have done a lot of research already. If you haven't already come across Steve Blank's work take a look at "The Four Steps to the Epiphany".

Since it is such a huge potential market, it might be a good idea to work on getting VC funding. The only caveat being, avoid "free" anything. Very hard to convert to paying down the track. You could give early users the option of investing and getting a chunk of discounted juror research for their money as well as equity. Since you are already in contact with lawyers you should be able to find some professional advice, etc.