Main/Search Warrants for Touch ID/c000051

Ryan, Couldn't one (validly) argue that in case 1, the act of providing the "opening fingerprint" is causing the individual to validate ownership/dominion/control over the device? It seems akin to the LEO's finding a bag of child pornography and forcing the suspected owner/possessor to acknowledge ownership/dominion/control/access to the bag-o-porn? I guessing I am missing something here. Russell