"  Isn't this an assumption of gross
 incompetency on the part of the lab as a
 whole?"

absolutely not

" Wouldn't such a problem invalidate all
 measurements of all substances in all
 research?"

absolutely not
 
I can understand the reason for asking both questions if the asker knows nothing at all about analytical chemistry or how to determine if data is good by routinely putting the proper checks in place.

Dick

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