US Mail-in Voting in California and Nevada Faces Fraud Allegations and Operational Scrutiny

California’s June 2026 primary used the state’s universal mail‑ballot system, delivering ballots to every active voter and extending the count for days while signatures are verified. Officials reported no unusual spikes in rejected ballots and said the slower tally is a built‑in feature, not evidence of fraud. Federal prosecutors opened a review after former President Donald Trump repeated claims of widespread fraud, but no systemic issues have been identified. State officials and fact‑checkers have debunked viral posts that misrepresented vote totals and ballot‑handling procedures.

In Nevada, the 2026 midterm elections will be the first full test of its universal mail‑in system, with about 2.3 million registered voters—roughly 90 % of the electorate—expected to vote by mail. Election officials cite logistical strain but point to safeguards such as signature verification, digital tracking and 24‑hour drop boxes. A 2025 audit showed a 3.2 % rejection rate for mail ballots due to signature mismatches or late arrivals, a figure the state says is comparable to national averages. Both states emphasize that isolated fraud cases are rare and that the systems include multiple layers of oversight.