I think that virtually all photo authentication at PSA goes through Marshall Fogel or Henry Yee. That is, they have other graders that first authenticate the photo, but Fogel or Yee also confirm the accuracy afterwards, and before the photos are shipped out. And both of them have other jobs, so they need to find the time to do this.
I think this is common with other things at PSA also. For example, for unopened material, I believe all packs are sent to Steve Hart at Baseball Card Exchange. Steve authenticates that the pack has not been opened, and then the packs go back to PSA to give a grade to those packs that have been authenticated as good by Steve.
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