This shall be interesting. Theres a couple things that need to be covered. Reminder this server wants to keep things realistic so lets do that.
THE BIGGEST ONE
1) If your friend is being arrested in a NCZ you should be able to help. Its a NCZ for petty things of course, but the idea of a NCZ is that it is a guarded area. Makes sense for things like stealing cars etc. But attacking a cop and saving a friend, it does not. Going into it there is already a cop or cops there, arresting your friend. You are willingly attacking an officer so therefore the idea its guarded is out the window because your attacking the person guarding it. This also adds more rp to the server. If you are being arrested in a NCZ there is nothing you can do. You cant attack the cop all you can do is run.. That means all the cop does is say stop and if you try to run he tazes you. No reason to not be able to save a friend in a NCZ, it removes the fun of being a criminal on the run.
2) COPS TAKING YOUR STUFF ON ARREST OR WHEN YOURE DOWN. Ive had plenty of cops take my bag, which is expensive, and food when being arrested. What should happen is it is taken and goes into prison and when you are released you can get it back. If that is not possible, you should be able to keep in on you because it cant do anything in prison.