Parshas Mishpatim

(24,3)1.Q Rashi d"h V'es kol ha'mishpatim says that this includes the 7 noahide laws, Shabbos, honoring one's parents, Parah Adumah, as well as the laws they learned at Marah. How can he include Parah Adumah in "mishpatim", it's the classic chok?