?? Why do you think this is standard protocol?
Sorry, I should clarify. I'm neither a certified pro nor an expert on this subject matter.
My wording was poor. Instead of saying it's "standard protocol", I should have said that's what I've observed seeing DSD at resorts and the first dive or two for OW cert. "YMMV". I have no idea what the "official" protocol is with various agencies, or if there even is one.
That said, none of that really matters anyway with regards to this case, because it will most likely boil down to expert testimony and case law.