The different opinions as to why there is a rule of דינא דמלכותא דינא and is there דינא דמלכותא דינא in Eretz Yisrael, here.
[Note: The Steipler would send to the להורות נתן and once said about him " הוא יודע הכל". He also wrote (I believe) 69 [!!!] sefarim]
