This is the kind of thing you can suss out of personal references. Of course, many people will provide the best / most reliable (for them) references they possi

This is the kind of thing you can suss out of personal references. Of course, many people will provide the best / most reliable (for them) references they possibly can, but you can still get a good signal with the right question. Ex. "Can you tell me about any times ____ pulled through without oversight", or "delivered something both useful and unexpected", etc. Anything that isn't a fast, resounding "yes" with details is probably a "no".