> These CBP officers who’re making up evidence for innocent legal/documented immigrants, what are they thinking?

I'm guessing... quotas? With significant economic incentive, official or otherwise?

> Or is there some kind of central source making up digital evidence?

This seems to be, by far, the most important question, and is kinda the buried lede here. Is anyone investigating this?

It raises a real question: can a free society survive in a digital age amidst a legal system which proscribes particular strings of data? It's so trivial to frame, much moreso than physical evidence. The evidence can be manufactured, as you suggest, without even the low-level agent performing the enforcement action realize that it is synthetic. It seems like an end-around the entire legal system.