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Re:FBI agrees to unlock iPhone for Arkansas prosecutor by cperciva on Thursday March 31, 2016 @06:05AM (#11396054)
parallel construction

You're probably thinking of "inevitable discovery", which says that illegally obtained information can be used anyway if the prosecution can show that they would have obtained it anyway. Parallel construction is something intelligence agencies do in order to hide how they obtained information in the first place (whether legal or otherwise).

Re:FBI agrees to unlock iPhone for Arkansas prosecutor by nxzero on Thursday March 31, 2016 @08:23AM (#11396616)
FBI, local law enforcement, etc use parallel construction too; for examples, look into how the FBI works with local law enforcement using tech like Stringray.