You've certainly got lots of data to train it with. And you can test it by simply testing its predictive power. But instead of selling it to the court system I'

You've certainly got lots of data to train it with. And you can test it by simply testing its predictive power. But instead of selling it to the court system I'd sell it as a service to law firms and/or use it in prediction markets. This would ensure that it would be funded and refined until everyone simply accepted its outcomes as a foregone conclusion.