There was a reply to a post here a while back where a persona basically wanted biblical law over all other laws (government, state, local). Part of be thinks that perhaps they don't understand what they are asking, but rather are parroting what they've heard preached.
Firstly, in today's Christian society, there is a lot of what is termed 'cherry picking.' Which is basically selecting what you agree with and tossing out the rest. Don't like same-sex relationships? Leviticus! Want to get divorced? No problem. Cheated on your wife? (Though in Leviticus 20:10 - "And the man that committeth adultery with another man's wife, even he that committeth adultery with his neighbor's wife, the adulterer and the adulteress shall surely be put to death.")
So, more than likely, the ones wanting biblical law don't understand they are probably guilty of something, but because they are interpreting, picking, and choosing as they please this isn't a consideration. If the bible is supposed to be what is desired as the go-to for what should be "law" then even the faithful are in deep doo-doo.
This doesn't even cover the fact there is the Old/New Testament, King James Version, American Standard Version, and so on. So, which bible would become "the law?"
This want for biblical law would also oppress us nones (non-religious) and any other religion that doesn't deal with the bible. It completely disrespects different cultures; which is what American tries promote itself as; culturally diverse.
If you are one that wants biblical law to be what everyone must follow, above everything else, do you think you are exempt from the laws yourself? Do you think you follow every single doctrine exactly? Would you obey every single doctrine exactly?
When you ask for biblical law, are you asking for the whole bible or just the parts you want?