[throwaway0a5e]

>make it absolutely explicitly clear that you can go to the on-site paramedics for anything and they won't incriminate you.

There's surely a threshold at which they will gladly incriminate you. The paramedics just can't reasonably foresee where said line is other than knowing it's far beyond the typical illegal activity you find in that setting. Moreover, I'm sure you could imagine in the case of federal crimes (drug trafficking, terrorism, high profile national news stuff, etc) the feds having no qualms about threatening to drag the paramedics through an expensive prosecution if they don't narc.