Threshold Identification of Ballots
About 60% of U.S. voters live in the 32 states that require a voter at a polling place to produce an identification document (ID) before casting a ballot. Among those states, 19 permit voters without ID to cast a ballot through alternative means, such as signing an affidavit; 13 strictly enforce the ID requirement. The other 18 states and the District of Columbia have a range of nondocument requirements instead.
The phrase "Threshold Identification" is literal, as in the Identification supplied at the Threshold. They are beginning to verify the legitimacy of the ballots cast in the election, starting with whether they were cast by legitimate voters.
Or so it appears. This is only a cursory glance, I've been wrong before. The document is very interesting, it's worth a read.