Comment by tp3z4u

By backchannel I meant via people. As in the Palantir analyst calls up their friends at the CIA/NSA for help. CIA/NSA data collection remains secret, Palantir justify their expense, and NYPD find the guy. The problem is that you can't reproduce your results. The other problem is the erosion of civil liberties - but I'm only speculating with a thought experiment.