Currently each state certifies/licences Emergency Medical System responders (EMT, Paramedic, RN). As I understand it there is no national recognition of state licenses. This means an EMT/paramedic from Oregon cannot respond to an incident in Ohio and still perform their level care as licensed in Oregon. This includes administering medicine/drugs.
It would seem to me that states (or the feds) need to address this inability of trained professionals not being to work in other states.
In many incidents, large and small, geography of the location can play a role in how much and how many EMS staff can respond and perform their duties.
It seems like like a simple fix, but it probably isn't.