LilyFestre-The china is 'treif' for Jews. They are contaminiated from a religious perspective, not from a health perspective. While observant Jews adhere to kashruth, it is not required-nor even expected-that non-Jews observe the laws of Kashruth, so they may use those dishes.

For those who question reasons Jews observe laws and perform rituals that are not found in the Torah or the 10 Commandments, the reason is that Rabbinic Judaism also follows the interpretations of Jewish law and living as promulgated in the Talmud, which in the most simplistic sense an amplification of the Torah. [I'll let Rabbi Sol get me out of this one on Sunday]. :>]