I believe they now have at least one line of oil that carries the API certification, but up 'till about 2 years ago NONE of their oils met the standard, or at least nione were certified. In the past, their oils did NOT meet spec, and today most still do not.
Now you are tha great test engineer. WOW!!!! I've been a mechanic since 1969, licenced since 1971, and have experienced obvious anti-drainback valve failure on numerous customer's vehicles. Many, although not all were Fram. I don't need to cut a filter apart or test it off the vehicle to know when one has failed (although I've likely changed many defective filters that I did NOT know were defective).
When an engine comes in clattering on startup and goes out quiet after an oil filter change, it's OBVIOUS the drainback balve is leaking.