Elon Musk condemns the use of electronic voting machines (EVMs) used in general elections in some countries.
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Brazil has used electronic voting since 1997 and has had no major issues since (there was a bad history of fraud in the paper ballot era). It runs on Linux and they hold a public safety test in the year before where they test the system's security.
If the machines are running open source software and are easily auditable that's fine. The problem is in the US, they're not.