The "justice system?" here in S. Nevada Is handled differently than a lot of other places. I challenged the enforcement of the helmet law, and realized that they would never let the ticket go to a trial, where it could be appealed to the supreme court. Up until that point, the prosecutors would be all about convicting you... once the point of no return was reached, they would fold. Same happened at my obstruction case, Once I appealed to District court, and paid $300 for a transcript the DA had a "Moral Moment" (1) telling the bald judge how I had been mistreated, as my discovery was never produced yada yada and he thought it in the best interest of human kind to dismiss, lol.
What I am getting at is this. I do not believe a library arrest will ever see a trial court that would set precedence unless we think out of the box. Here is what I feel gives us the best chance, Once someone gets a citation (arrest) Same standing (2). they will have a pre trial hearing and plead not guilty. This is allowed as it is the time for you to sweat the bogus charges and hire an atty. etc. There s then a little known short window 10 - 30 days which you can file in Federal court to have your case removed. I believe we would have standing in this arena because Open carry beyond Schools day cares leg bldgs, is not regulated by the state. Had Nevada wanted no firearms in the library's they certainly could have put that in the law. yet they did not.
If you have to appeal the Federal case (likely) it will go up to San Fransisco to the 9th circuit, Not necessarily known for being gun friendly, but it most likely would be on appealed on an administrative item.
That is probably the best avenue for change, through the courts.
I have another idea, that we can mull over, it is one I think should be discussed in person between interested party's
