Definitely a huge +1 from me. ShyNudist hit it spot on with their assessment and modifications/recommendations.
I think a good small-scale starting point is to develop a comprehensive BAR exam and application process to becoming a Lawyer. From there, create and publish a Los Santos Citizen's Rights document so that citizens are aware of their basic rights on the server; it seems that there is a fair bit of confusion from both the LSPD and the general population as to the basic rights of a citizen. Considering we have many players from various nationalities, "common sense" rights are a bit out the window. We need to have a written document so that everybody is on the same page. Part of this document would be the right to a State Sponsored Legal Attorney if requested.
I think setting up this system could have extensive RP benefits. As opposed to the PD/Admins essentially being judge, jury and executioner, there is a chance for the defendant to get their case dropped, their sentence reduced, or even potentially extended if the situation warrants it. Of course, as previously pointed out, this whole process from start to finish could take upwards of an hour. If all necessary parties are not available/online (Arresting officer, Defense Lawyer, and Judge), then the system ought to default to how it is now, with the Penal Code providing the sentence.
