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DavidPSA has made some bonehead mistakes before (not just grading or trimming issues), so the fact that someone got some Nodgrasses graded by them does not neccesarily prove much about the sophistication of the forgery. PSA is trying to turn out slabs like McDonalds hamburgers, so if you catch them on a Monday morning or Friday afternoon, you will never know what might happen. There are more sophisticated tools used by museums and some collectors that will be usefull for alteration detection-- like the infrared viewer, which is sort of an advanced black light. Infrared viewers are those things that they use to see the original painting behind newer paint, and they can even be used to identify the actual chemicals in paint/ink/paper. I own a hand-held one and will use it on anyone's Nodgrass, provided they buy me a cup of coffee and say nice things about my dogs.