We know that parallel construction has, at various times and in various places, been heavily used by some law enforcement elements. We don’t need to know anything about the software used by law enforcement to know that, and to suspect that this may be happening now. Systems such as those provided by Palantir are just a more sophisticated way that tainted evidence could be used.

It seems reasonable that, given a reasonable suspicion that such evidence is used, that we should fear and want to prevent more widespread and systematic use of that illegal evidence.