From one who spent the most frustrating year of his life on '81-'82 Grand Jury, my thanks to Robert Stewart for his in-depth articles.
It's been a long time since I've seen such accurate work in your paper. He covered the two main barriers to an effective jury, i.e. the selection process and continuity gap, obviously from hours of in-depth research.
The only addition I could make would be having the private sector support the system by "volunteering" managers for a year with full pay as did Arco and the Pacific Telephone Co. in my year.
I would also suggest public "watchdog" meetings and encouraging colleges, as did Orange County, to give academic credit to students who would volunteer for one year on the Grand Jury.