PE Stamp when QA/QC
I did a Google search on "Professional Engineer Stamping" and found the following, which gives some guidance to the questions asked:
"The earmark that distinguishes a licensed/registered Professional Engineer is the authority to sign and seal or "stamp" engineering documents (reports, drawings, and calculations) for a study, estimate, design or analysis, thus taking legal responsibility for it."
This clearly states that the one who stamps a document, is taking legal responsibiliity for it. If one is not convinced of the engineering integrity of what is being reviewed, one should with hold his/her stamp of approval, in my opinion. Besides, the original engineer who did the work in the first place is the one with the obligation to stamp his/her own work, and not to pass it on to another, again in my opinion.
Walter L. Elden, (Ret P.E.)