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If every diver should test every fill, then the analysis should be a part of the entry level course (1*, OWD, or equivalent).But every DIVER should test every fill!
Tragic and completely avoidable if this is indeed what happened.
Whether I requested trimix, nitrox or simply air, I cannot imagine diving any tank I didn't personally analyze and mark right before the dive.
Actually it's very rare to analyze air tanks. Anyway it's good for you.