Re: err ,,,,
I used to belabour this same argument about "unless" vs "until", but eventually someone who was actually a lawyer showed me that the case is "until" and always has been, dating right back to Roman law in essence and back to the 17th century in practice.
The bottom line is that in law neither Unless or Until are used, but instead it is called "presumption of innocence" and fundamentally means that the state (or prosecuting power) must begin with the assumed innocence of an accused party.
Even the universal charter of human rights says "until". So, whilst I might agree that "unless" would be more grammatically and linguistically accurate, it is not the case that using "until" is newspeak.