Ah yes, it looks like Deuteronomy reiterates some of the rules that were originally laid out in Leviticus. This is the book that talks about everything that is unclean, and how people purify themselves. It is also very largely concerned with the intricacies of how and when to sacrifice animals.

Again, as has been pointed out, the real issues here are not head scarves or food. I'm asking what the logical system is that people use for saying whether Biblical laws still apply or not, and how you know whether a rule is a societal custom or a command from God not to sin. And at the bottom of that is the issue of interpretation. In my opinion, it is impossible for anyone here to demonstrate that they or their denomination don't interpret what the Bible says to some degree. If this were not the case, presumably we'd still be publicly stoning people to death.