"Dr.":

Congrats to Jason Kuznicki for successfully defending his doctoral thesis from John Hopkins and earning the title "Dr." As I noted in the comments I too (or anyone with a JD law degree) could demand to be called "Dr." as well. Technically "JD" stands for "Juris Doctor" and we are "Drs." But in reality, the JD isn't as onerous a task to complete as a Ph.D. (Mainly because we don't have a dissertation requirement. I did have to take two legal writing courses -- one that produced a law review style research paper and the other, a series of shorter papers. But again, those requirements aren't nearly as tough as the dissertation.)

I think it too pretentious for "JDs" to go by "Dr." (although some do). For an interesting history of the "JD" or how a standard law degree went from a "Bachelors" (LL.B.) to a doctorate (JD), see this wiki link, which is more or less accurate. Historically, and it's still this way in Europe and other foreign nations, a "law degree" was a standard 4-year bachelors. ("[A] law student would attend a four-year undergraduate program culminating in a LL.B. degree. He could then go on to get an LL.M., 'Master of Laws' and then an LL.D., 'Doctor of Laws' degree.") There still are LL.M. degrees (one of which I have in Transnational Law). And the "LL.D." is now usually referred to as an "SJD" (although, the wiki link refers to it as a JSD). The SJD does require a dissertation. And those who get them do deserve the title of "Dr."

BTW: My alma matter, from which I hold JD and LL.M. law degrees, recently enacted an SJD program. Something I might consider for the future. But with three graduate degrees (I also have an MBA from Temple) I think I have enough for now.