gianaameri
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This gas analysis you are asking for isn't inexpensive. To conclusively rule out any possible scenario would require an analysis for thousands of possible compounds that can exist in the gas phase at scuba pressures, and which also might possibly contribute to incapacitation at the depth the diver became incapacitated. To develop the data set necessary to achieve 95% certainty that nothing toxic was present would be really expensive. Then you would have to add in the costs of interpreting the data set using expert testimony to ensure you've excluded anything that contradicts the witness statements, which support death by misadventure.
It's all about responsible use of limited government resources. Americans are willing to accept a reasonable explanation for a fatality given reliable statements from witnesses. They are not willing to pay for huge government infrastructures to extract the last bit on insignificant minutia from every accident that occurs in their jurisdiction. While some countries with large debt to GDP ratios do perform these nanny state functions, the US does not, and Americans are quite satisfied with their system.
What you are asking for would be considered an irresponsible misappropriation of government resources by most US taxpayers. More likely, taxpayers and legislators would prefer to regulate the root cause, recreational diving, before they added new burdens to the police who are busy enough with community policing. It would be far cheaper to prevent the fatalities through oppressive regulation of the currently unregulated recreational scuba hobby than to chase minutia after every accident. As a recreational diver, I'm satisfied with both the current level of accident investigation and the current level of regulatory interest.
Frankly, I'm flabbergasted that a recreational diver would insist on the level of government interdiction into their hobby that you so fervently desire.
A person died.
What if was your son or daughter?
In a modern and advanced country like the U.S. it is surprising there is not a protocol to follow by the Police in case of a diving fatality and a small budget towards the writing of the protocol and the training for the Police to be able to read it and follow it.
Where is DAN USA and why are they not doing anything about this (it is not good for their insurance business that an investigation is conducted in this manner)?