And this is just the States, there are other countries that use similar systems for jury selection.
I agree I won't make that until there is a mature product, but the question was addressable market, not expected year 1 revenue.
The mvp I'm working on now allows the sharing of information about jurors. This should allow me to gather data on how jurors vote tat can be marketed while still making profit off the sharing app alone.
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.
On the flip side, where I'm located the 120k from yc seed money would be a year's runway for me and a cofounder or two. That and there is more talent here than people think, or at least more good devs looking for work than hiring.
If anyone has some contacts or VCs want to get in contact with me take my username at Gmail to talk.
Request the Startup Ecosystem Report from here:
http://startup-ecosystem.compass.co/ser2015/
Great research. Interesting notes about Chicago in there.
Realistically, you might need to create a MVP with lots of manual processing to test the market. Or, find a VC who will believe your projections.