The evidence suggests that voting by mail does not increase the risk of voter fraud. According to the Brennan Center for Justice, "Election officials have found that cases of fraud involving absentee voting are extremely rare. In fact, a 2017 study by the Washington State Auditor's Office found that out of over 3 million absentee ballots cast in the 2016 and 2018 elections, only four were found to be fraudulent.

This is because there are a number of safeguards in place to prevent voter fraud in absentee voting. For example, states require absentee voters to provide their signatures and other identifying information when they request and return their ballots. These signatures are then compared to the signatures on file for registered voters.

In addition, many states require absentee voters to have their ballots witnessed by a notary public or another credible witness. This helps to ensure that the voter is the only person who casts their ballot.

For these reasons, voting by mail is a secure and reliable method of voting. It does not increase the risk of voter fraud, and it allows more people to participate in the democratic process.

Here are some additional resources that you may find helpful:

* [Brennan Center for Justice: Election Fraud and Abuse](https://www.brennancenter.org/our-work/research-reports/election-fraud-and-abuse)

* [The Myth of Voter Fraud](https://www.nytimes.com/2016/08/28/opinion/the-myth-of-voter-fraud.html)

* [A Look at Evidence Supporting Increased Risk of Voter Fraud in Mail-In Voting](https://www.heritage.org/election-integrity/commentary/a-look-evidence-supporting-increased-risk-voter-fraud-mail)