from my SLF point of view, this seems bizarre.
If the plane is in the US, the crew should be subject to the same post crash checks as a US based crew.
I don't recall any road users getting exemptions after crashing a company car, just cos their company was based elsewhere.
Odd. The US gets to throw it's weight around on so many things, and yet in this which would seem to be a no brainer, it's not clear?
Not that I suspect alcohol or drugs were a factor in this case, but I think it's a loophole that needs fixing.