Definitely an interesting area of the law to get into! My advice from yesterday still holds--focus on those underlying skills and look for opportunities to get field experience in your area. You should go to the best law school you can get into (taking costs/scholarships into account) because that will open the most doors for you. Virtually any school will offer courses on civil rights, international, and constitutional law and that will be the foundation you need. Specialization comes more from the firms you work with than from the law school curriculum.
Continue to research your specific area of interest. Look up current cases related to your topic and you can find lawyers and organizations who are working on these issues. For example, here's a brief for a case the ACLU is working on that's related to drug law reform. The first page lists the brief authors and the organizations they are affiliated with: https://www.aclu.org/legal-document/bir ... icus-brief
. Follow cases like this. Read all you can about your area and learn about the cases as well as the individuals and groups working on them. And when you have opportunities to choose your own topics for papers, write about your area of expertise!
As for a joint JD program, a PhD program might be helpful for becoming a professor, but it is also not totally necessary, especially if you want to get several years of experience practicing in your field before you become a law professor. Consider that a PhD will add a significant amount of time to your degree, time that you might feel would be better spent getting out there and getting experience in your field. A PhD program will train you in academic research which may not be immediately helpful to you as a practicing lawyer. So you have to carefully consider whether you think the additional time and monetary investment is worth it
I think the takeaway here is that you don't have to have your entire career planned out just yet! You'll be exposed to a lot of ideas in law school and as you learn more and gain more experience, you might find other specialty areas or career opportunities that pique your interest. So the first step is really just to focus on getting the best LSAT score you can so that you can get into the best law school you can so that you will have the opportunities to do everything you are planning and/or some things that you haven't planned out yet!