Several times already I've edited questions to tag a specific field of law, since I thought this helped make them clearer (such as labor-law, or criminal-law). Is this something we should actually be striving for? Or is the jurisdiction of a question along with the topic (say, radio) clear enough without bothering to add the relevant field of law (almost) every time?
Tagging questions with only the jurisdiction and some vague topic (like 'radio') is not a great way to organize your content.
Since the areas of legal practice are relatively well-established specialties that folks are likely to study and practices, tagging the questions as such sounds like a great idea.
Since the correct field-tag isn't necessarily obvious when someone is asking a question, you will likely have to help these folks add the correct tags until the practice catches on.