Manipulating images for presentation is an automated process unless you're ripping someone off. The changes would be uniform across whole sets.
The problem with trying to pass off a fake image is that you need to be more knowledgeable in each dimension of the effort than the recipients are in just one. If anyone remembers the folks identifying East German video from background hum it's kind of like that.
It seems nearly impossible to imagine that to be the case. I'd have to disregard the kinds of manipulation entirely. What sales manager would create a whole western block sequence by copying, rotating, and flipping a single element?
Scientific advertising and marketing is actually its own small specialized field, and is done by people with a solid technical background (we produce a whole lot of advanced STEM degrees, there's plenty of folks available with this sort of background).
So I just want to be crystal, crystal clear here: there's no way in hell anyone involved in this pipeline should have any confusion as to whether drawing on gel photographs in photoshop and/or copying and pasting blots is fraud. "Proofer" or not.