Actually it is pretty standard at most reputable dare cares these days. We have to do it when we drop off our children and pick them up. It is an excellent security procedure.
I see no reason why this should not be the universal means of ID - that or retina scan.
This would remove the "affordability" issue of showing an ID in order to VOTE.
Of course the criminals may not like to risk illegally voting if their fingerprints could ID them.
Ought to have a LEO at every voting place just to arrest any voter with an outstanding warrant.