Which voting technology innovation was widely implemented after the controversial 2000 US presidential election and the 'hanging chad' controversy?

Electronic voting systems have dramatically changed how citizens participate in democracy. These technologies have evolved significantly over the decades, facing both enthusiasm and skepticism from voters, politicians, and security experts alike. This trivia question explores a pivotal moment in the development of modern voting technology that impacted government operations and public trust in electoral systems.

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Direct-recording electronic (DRE) voting machines
Blockchain-based mobile voting apps
Mail-in optical scan ballots
Biometric voter verification systems