That, incidentally, is another voter suppression strategy to make the lines so long that people are forced to choose between being late for work/appointments or getting to vote. And this has a fun additive effect with other voter suppression strategies. If the lines are long because the precincts are too few and under-staffed, you can make the lines EVEN LONGER by making the poll workers review IDs, explain to each person what is and isn't a valid ID, have to explain the provisional ballot process because they don't pass some arbitrary rule, and so on and so forth.