Are you sure they're using contact tracing _apps_? The original tweet says:<p>> Minnesota Public Safety Commissioner John Harrington says they've begun contact tracing arrestees.<p>> "Who are they associated with? What platforms are they advocating for? ... Is this organized crime? ... We are in the process right now of building that information network."<p>I interpreted that to mean ordinary detective work. I don't see any indication that they're using data from COVID-19 contact tracing apps on arrestees' smartphones, which is what the Hacker News title seems to imply.