I think the usage of Latin is very effective in this case; The meaning of the Latin words themselves is not important, the jargon is defined in legal texts and in the law. Meanwhile, the usage of Latin allows you to quickly identify which parts are legal doctrine - e.g. an "ex-parte decision" sounds like legal doctrine, "the judge made a decision without telling the other party" sounds like the judge had a grudge. I think in that sense, using a dead language is very appropriate; our jargon is a mixture of "kinda-like-but-not-quite" terms - memory, inheritance, relational, bus(actually a contraction of a Latin word), master/slave; and arcane words that might as well be Latin(multiplexer! polymorphism! bandwidth!). At least you can't really mistake the second group for anything but jargon.

While people might not have to interact with engineering jargon, they are often forced to interact with legal jargon at some of the worst times in their life; I think it's good signaling if they can easily identify whether someone's entering into a "legal interaction" with them rather than just a regular talk.