Because I delight in delivering bad news, I'll point out that the real takeaway shouldn't be that federal LEOs regularly lie (though, they do) - it is that they are permitted to lie convincingly through handwavy technical means. All these tools are designed to give them permission to totally destroy your life. I'm aware of only two geewiz CSI methods that are actually founded in science: cryptography (this neural crap doesn't qualify) and DNA. Unlike fingerprints and bitemark analysis, those two tools were invented outside of law enforcement - instead of being purpose built for prosecution. Anybody doubting that should look into the history of the polygraph and its continued use in the face of evidence demonstrating how useless it is in the pursuit of truth... which begs the question: if they aren't interested in the truth, what are they doing?

https://en.wikipedia.org/wiki/Polygraph