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

DNA is only mostly founded in science. There's the interpretive element in saying: Oh, this DNA matches the suspect, even though it's mixed with the victim's blood.

Nice big clean sample? It probably actually matches. Small sample? Mixed with other people's DNA? Especially in a place they tend to visit (or live in?)?

At that point the problem isn't the science behind DNA, it is the fact that your freedom depends on a jury understanding statistics. But at least there exists the opportunity to challenge the evidence on objective grounds, that unfortunately requires an expensive professional expert witness...