oxygen - i would take it from anyone who could assemble the gear or from my self if i was able.
good Samaritan laws in calif are quite strong and VIGERIOUSLY supported by law enforcement in ca. I know.
about 10 years ago I was the first uninvolved motorest at a 5 car accident, on hyw 101 north of santa rosa (about 100 miles north of san francisco). actually i was uninvolved only by chance, the victims cars went all around me.
i stopped and examined the wreckage. two cars had people that were uninjured, one was a roll over, one had collided with an embankment, and one (with two adults and three children) had been hit directly in the driver side.
a nurse was helping the rollover victims; i went to the car that hit the embankment. the driver had obvious serious head injuries. I did an initial assessment of level of consciousness, got three, the proceeded with a full assessment. after that completed I got into the car, performed c-spine, and waited for help which arrived.
15 min later a fire dept paramedic arrived and did LOC and got 1. then they airlifted the driver (and the driver of the rollover) to a hospital. both survived. my driver ended up with permanent neurological impairment.
highway patrol asked me a few questions then escorted me away (there were fire trucks, ambulances, and hwy patrol cars everywhere). they did not ask for my name or drivers license.
6 weeks later I got a call from the local DA who said I was being sued by the driver (who got my license plate number and ran it down). he said that as a matter of public policy and law he believed I had no problem and would like to defend me at the counties expense. I checked a bit and called him back and said go for it. there were three hearings and the DA was present at all. I was never required to appear.
the judge ordered the matter dropped, and reprimanded the driver.
the da explained that under their interpretation of the good Samaritan laws, if you did anything that you were trained for, or that common sense dictated or that seemed reasonable (to a person with you level of training and background). they (the county DAs office) considered that covered. they specifically wanted to be robust in their interpretation of the law.