Nit-Ro-Gen

Ok if somebody was wanting to go with Nitrogen would you have to have special airlines,valves,baggs,and a regulator.And anybody that has a Nitrogen setup,will the cops mess/harass you about it?what size hose would you go with?How would you route it(from the regulator to a Tee fitting then to you valves)what size is the regulator(3/8,1/2,3/4)Thanks