Missouri Employment Eligibility Verification is a state government program designed to help employers verify that their employees are legally allowed to work in the United States. The program requires employers to use the E-Verify system to check the identity and employment eligibility of newly hired employees and existing employees in Missouri. E-Verify is an Internet-based system that compares information from an employee’s I-9 Form and other supporting documents to records in the Department of Homeland Security (DHS) and Social Security Administration (SSA) databases. There are two types of Missouri Employment Eligibility Verification: mandatory E-Verify and voluntary E-Verify. Mandatory E-Verify requires employers to use E-Verify for all new hires and existing employees in Missouri. Voluntary E-Verify allows employers to choose to use E-Verify on a voluntary basis.