Dusting and lifting all the prints to be found in public spaces is infeasible and the results can't be correlated with identities. The move to mobile phone scan

Dusting and lifting all the prints to be found in public spaces is infeasible and the results can't be correlated with identities. The move to mobile phone scanning opens the door for more cheap, mass digital data harvesting. In effect, you're making the same argument that claims it's OK if the government track every car in the country by optical plate recognition, across a vast camera network, because "Hey! you're out in public already!" The difference in both cases is only a matter of difficulty.