I train periodically for a small subset of medical response skills, but I'm not dedicating the kind of time to it that would be required to keep the license up to date.
And I would hardly assume "no experience"; though I've not done paid paramedic duties, I have been the first person or persons on the scene of multiple vehicular accidents and other trauma events, and able to positively contribute to keeping people alive and stable until FD or medics arrive. If I see something bad happen, I stop to help, because that was what I was trained to do, and because it is the right thing to do.
