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Reason is that copyright terms are so damn stupidly long. Given that a work is not only copyrighted for the life of an author, but for years after that, it is a major problem. What happens if an author has died and you really aren't sure who owns the rights?
If copyright got dialed back to a reasonable term, then I'd say sure, let's not do this. Google can publish anything out of copyright, or anything given to them. However as it stands if you don't have some sort of opt out system it will mean that defacto almost nothing will be available on there.
Probably a lot of books written on it -- Atul Gawande did a pretty big "study" with safety checklist prior to OR activation. We have several checklists (independent of anesthesia) before starting any invasive procedure, so this is kind of behind the times. It is more targeted at foreign hospitals or places that have a lot of mid-level providers that are not used to things. If you are interested, the full study can be found here:
>Says who? Citation Please?
[snip a bunch of rhetorical questions]
From your questions I infer you are completely out of touch with this field in any sort of form. If you want a citation, do a tad of research on your own and you will discover things; I won't spoon-feed.
Poke around here to start (but some of this might be biased the *other* way.) Do a good deal of academic reading and you will get a good feel of what is going on: