From the Document: "Election officials conduct checks throughout the election cycle. They set up controls to guard against unauthorized access to voter registration rolls, for example, and to help ensure that poll workers follow the correct procedures. Some election checks focus on the vote counting stage of the process. They aim to ensure that the equipment and procedures used to capture and count votes report the right election outcomes. One tool officials can use to help check the accuracy of election outcomes is a type of post-election audit known as a 'risk-limiting audit.' Risk-limiting audits have been recommended as an election security measure by the Senate Select Committee on Intelligence and the National Academies of Sciences, Engineering, and Medicine, among others, and are the subject of ongoing activity at both the state and federal levels."
CRS In Focus, IF11873
Congressional Research Service: https://crsreports.congress.gov/