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The FBI Wants You to Know it Has Not Changed its Position on Encryption. And That’s a Problem.
(www.techpolicy.press)
This is a most excellent place for technology news and articles.
https://en.wikipedia.org/wiki/Parallel_construction
Here's a whole ass Wikipedia article on the very subject, because it's been so widespread for so long it has a fucking name.
https://en.wikipedia.org/wiki/Hemisphere_Project
Here's a Wikipedia article on the mass surveillance by the DEA, which is where the data used for parallel construction was sourced.
https://www.reuters.com/article/us-dea-sod-idUSBRE97409R20130805/
Here's a good example from the first Wikipedia article about how the Feds pass signals intelligence to local law enforcement so they can start cases and claim they found the initial evidence some other way than illegal mass surveillance.
For more history about attempts to install backdoors, see:
https://en.wikipedia.org/wiki/Clipper_chip
That's a wicked response. Thanks big!!