That certainly will be necessary to convince the "straights." I know from experience that many people don't automatically spot the repeating pattern.
But there's a reason so many Photoshoppers are jumping up and down here: this is a rookie mistake. It's easy to do, hard to overcome, and everybody who works with Photoshop has struggled with it. When you do this for a living, it SCREAMS out at you.
Kinda like the fonts thing on the CBS story.
just because Reuters posts the pic with a story doesnt mean they actually took it. They could have bought it from a freelance journalist/photog who was trying to make a good pic in order to have future pics bought