1. Please do not re-post the same question in multiple forums. It's against the ToS
2. The OP is talking about doing an MD/PhD -> EM -> Tox fellowship.
3. As I stated in the other thread, tox is a place in EM where I'd think a MD/PhD could consistently expect institutional support across the US. By that I mean, there are programs that excel in, and have great young faculty support for, studies in sepsis, resuscitation, and so on, but you won't find those centers of excellence in all places in the US.
4. In terms of the clinical practice and the research, I thinks there could be a great deal of conceptual overlap between a biochem/pharm/tox PhD and EM/Tox practice, making it much easier to work between the bench and the ED.