My public health law professor advised me that if I was really interested in health policy and law in addition to considering a PhD I might also want to consider a joint MPH and JD program. He originally got a PhD in Biology and went back and earned a JD himself. This actually intrigued me because I do feel like depending on what you want to do in policy being able to practice law yourself might be a huge advantage in the job market. I know the job market for law overall is bad but very few lawyers have educational expertise in the area they practice in (for instance my professor is an environmental lawyer). It's a little quicker than a PhD and in some places you can go to law school part time and work your way through getting experience at the same time. It's something to think about I know I'm thinking about it. 🙂