Here’s the website where it says

A person must be a U.S. citizen in order to register and vote.

So, let’s say, somehow someone that isn’t a U.S. citizen votes in an Arizona election for a federal office, say…the president. How will that be verified?

Well, first of all, this is Arizona we’re talking about, which barely went to Biden during the 2020 election. So there are plenty of “election integrity” watchers or whatever they liken themselves to be. And an immigrant, documented or otherwise, would want to jeopardize their chance in the U.S. to vote in an election at the federal level under the conspiracy-addled eye of Arizona republicans. Because if they’re undocumented, they will almost certainly be deported. If they are documented, their legal status could be stripped, and they still be deported.

And for what? To be a lone vote in a sea of 150 million to decide the presidency?

Conservatives are wild with their fears. Immigrants are both desperate to trek hundreds of miles through treacherous territory for life in the country on a hill, only to risk it all for the most insignificant method of tipping the scales in a federal election.

Your imaginary villains are irrational.