In the broader world of science, it is well recognized that parts of the measurement system need to be demonstrated to be in control and properly calibrated as well as properly used by a trained and knowledgable operator. It is through these basic fundamentals that we can infer with sufficient confidence that our testing is both accurate (from from bias) and precise. In the below hyptertext link we find a retraction of a peer reviewed paper based upon violation of this axiomatic principle.
Scientific experiments are like recipes: With the right components and the proper steps, the end result can be a thing of beauty. But if you start with a cup of salt instead of a cup of flour, well, even the neighbor’s schnauzer won’t touch that batch of sugar cookies.