I did not know this. When I received my divemaster certification back in the 80's we were taught (NAUI) there was no duty to rescue anyone unless we were actively acting as a divemaster at the time. I admit I have not divemastered for 30 years.
Granted, I would hope any of us would jump to the rescue of any diver in trouble as long as it was within our physical capabilities to do so; however, I did not know it was now a full time responsibility that came with the certification. When did this change and do all certifying agencies adhere to this?
I had a DM tell me this. The rational was that the DM is trained to provide assistance and there for has no way to justify seeing and ignoring a situation. They cant say they did not know what to do to help. the same thing goes with Master divers since they have to have rescue. Being a non active DM may be a different thing. He also brought up the issue of if anything happens they look up all the divers in the area so that again if you presented a AOW they would know you were DM qualified and curently insured proving you were active. that too,, may vary state to state. He says it is treated as a paid publlic servant. like a fire truck can not pass an ongoing fire without stopping if they see no department is present and is not on a call, they have to at least call it in as a minimal response and continue to their assigned scene. Once you become a company man you sorta loose the good samaritan options. the problem to pointing blame is this,,,, can you prove the DM knew there was a problem or not. Probably a hard thing to prove in many cases, but very simple on other cases. Doctors have the same issue when coming on a scene while traveling. They are required to stop and at lest offer assistance. but if no one knew you were there you just drive by with out stopping to avoid being sued.