A study published by The Washington Post found only 31 different incidents of voter fraud since 2000 that an ID law could fix. During that same time, more than a billion ballots have been cast in general and primary elections alone. The study by Justin Levitt, an expert in constitutional law, found those 31 incidents also represent claims, and some have not even been investigated or prosecuted (and could therefore be debunked). Those 31 potential incidents stack up against the 3,000 votes in the four states with strict ID laws that have been rejected for lack of ID.