There's nothing about a J.D. that makes a person less entitled to the doctor title than other professional doctorates. And unlike medical school graduates, many law school graduates are actually fairly prepared to start practicing after graduation. The only difference is that there isn't a history of using the title in this profession. It is a doctoral degree, and the doctorate is even designated as "Doctor of Jurisprudence" or more commonly "Juris Doctor". Is the person a doctor? Yes. Does that mean it's customarily a good idea to use the title? No. Most would probably consider it tacky. Could this change in the future? Yes, and it probably will. Some college like Yale or Harvard will probably encourage its professors to start calling themselves "doctor", and it will go from there.