once, or a person who is not eligible to vote does so by voting under the name of an eligible voter. In the United States, voter ID laws have been enacted in a number of states since 2010 with the aim of preventing voter impersonation. Research has shown that voter impersonation is extremely rare. There is no evidence that in-person voter fraud has changed the result of any election. In a few cases, permanent residents ("green card" holders) have registered to vote and have cast ballots without realizing that doing so was illegal. Non-citizens convicted in criminal court of having made a false claim of citizenship for the purpose of registering to vote in a federal election can be fined and imprisoned for up to a year. Deportation and removal proceedings have resulted from several such cases. In an analysis by the Brennan Center for Justice at the New York University School of Law looked at 42 jurisdictions, focusing on ones with large population of noncitizens. Of 23.5 million votes surveyed, election officials referred an estimated 30 incidents of suspected noncitizen voting for further investigation, or about 0.0001% of votes cast. Douglas Keith, the counsel in the Brennan Center's Democracy Program and co-author of the analysis, said, "President Trump has said repeatedly that millions of people voted illegally in 2016, but our interviews with local election administrators made clear that rampant noncitizen voting simply did not occur. Any claims to the contrary make their job harder and distract from progress toward needed improvements like automatic voter registration." Voter registration irregularities Voter registration is the process of collecting applications to vote, adjudicating those applications, and maintaining the rolls of qualified voters. The process of voter registration is generally left to the states. In an effort to increase voter turnout, a state may adopt less restrictive policies, including motor voter registration and same day registration. In an effort to decrease in-person voter fraud, a state may adopt more strict policies for registration, including proof of citizenship at the time of registration. Federal elections do not require proof of citizenship, only a statement on the signed application. Voter rolls have high rates of inaccuracy. Voters move, die, and are incarcerated. Voter rolls may include erroneous superfluous entries as a result of fraudulent registration or failure to purge the roll when a voter dies, moves, or is sent to prison. A qualified voter may