For years, states have been sounding the alarm about voter fraud and pushing laws to prevent it. One such law would require voters to prove their citizenship, with a birth certificate, passport, or the like, before casting a ballot. This month a federal court slapped down proof-of-citizenship laws, but not for good. The opinion leaves wiggle room, and state lawmakers are not giving up. They are, however, wasting their effort. Anti-fraud measures can make elections safer in some circumstances, but usually they either have no effect (other than creating red tape) or make matters worse. My research proves it.