Broad restrictions on voting by mail disenfranchise more eligible voters than they prevent election fraud

What's this about?

People disagree about whether broad limits on voting by mail stop more fraud than they stop people from voting.

The answer depends on the rule and how much trouble it causes voters.

What supporters say

• Mail-ballot rules can reject valid votes because of wrong signs, late dates, missing witnesses, or ID mistakes.
• Few studies show that mail voting fraud happens often across many places.
• These rules can hurt some voters more, such as people with health needs, hard work hours, or no easy ride.

What critics say

• Mail voting has real weak spots that someone could use to cheat.
• Some rules may stop hidden fraud that election workers might not find later.

How to read this

The number of points on each side does not show who is right; stronger proof matters more than a longer list.

The bottom line

The evidence leans toward the claim, but only for rules that create large voting problems.

We are not sure every rule does more harm than good, and broad limits lack strong proof that they stop much fraud.

The claim is that broad limits on voting by mail keep more eligible people from successfully voting than they stop from committing election fraud. The evidence points in that direction, but only conditionally: the result depends heavily on which rule is used and how much it burdens voters.

The case for

The strongest evidence concerns ballot rejection. Signature checks, witness rules, identification requirements, postmark deadlines and other technical conditions can cause an otherwise valid ballot to be rejected. Voters may have chances to fix mistakes, but curing procedures do not eliminate every lost ballot. A Florida study tracing mailed ballots through casting, rejection and curing is especially relevant, although the available record does not show its precise estimates. (see Figure 2) 1

These requirements can also impose unequal burdens. Voters with disabilities, inflexible work schedules, caregiving duties, limited transportation or fewer administrative resources may have more difficulty meeting a deadline, finding a witness or correcting an error. Research on voting restrictions generally finds that rules that look neutral on paper can create unequal costs in practice. Mail-ballot studies specifically document unequal exposure to signature, witness, postmark and deadline mistakes. 3

The case for broad restrictions is further weakened by the limited evidence that mail-ballot fraud is widespread. Researchers distinguish between vulnerabilities—ways a system could be abused—and proof that abuse happens often. Existing studies show that fraud incidents have occurred, but they do not establish that broad restrictions prevent more fraud than the valid participation they suppress. 2

At the same time, access problems should not automatically be equated with large changes in overall turnout. Studies of universal vote-by-mail and other convenience measures often find modest or mixed effects on jurisdiction-wide turnout. That means the access argument may be strongest for particular rules and for voters who depend on mail voting, rather than for every restriction or every jurisdiction. (see Figure 3)

The case against

Mail voting does involve real security risks because ballots are cast outside the controlled setting of a polling place. Potential problems include coercion, ballot interception, improper assistance, organized ballot collection and failures in the chain of custody. Identity checks, signature verification, witness requirements and other safeguards may reduce some of these risks. 4

The absence of detected fraud does not prove that no additional offenses occurred. It also cannot show how many offenses were deterred before they could be found. Some restrictions might therefore prevent fraud that administrative records never capture. 5

That possibility creates the central difficulty in the debate. The available evidence does not provide a common measure comparing the number of eligible ballots lost because of a particular restriction with the number of fraudulent ballots that restriction prevented. Rejection and curing rates vary across jurisdictions, and the cited Florida study’s precise estimates are not available in the record. Some sources also come from institutions or advocates with clear policy positions.

The bottom line

The evidence moderately favors the claim, but only for broad restrictions that create substantial access or ballot-rejection burdens. The access side has stronger direct evidence: rejected ballots and unsuccessful curing attempts are observable administrative events. The security side shows genuine vulnerabilities, but relies more heavily on an unmeasured question—how much fraud a particular restriction prevents, including fraud that would otherwise go undetected.

The evidence does not support treating every mail-voting rule as harmful or unnecessary. Narrow safeguards aimed at documented risks may be justified, while broad limits on eligibility, ballot return or curing are more vulnerable to the criticism that they block legitimate voters unnecessarily. The main uncertainty is not whether either burden exists, but the rule-specific size of each: how many eligible voters are excluded, and how many fraudulent votes are actually prevented.