This borrows a number of points from All the President's Men (1976). There is a Deep Throat character, a "follow the money" assertion, and a 'special signal' for initiating clandestine meetings. Ben even mentions the movie.
This was the only time when Matlock acted as a prosecutor.
Mike Farrell also played a judge in the two-parter Judge, Jury... (2019) and ...and Executioner (2019).