"E-Verify (formerly known as the Basic Pilot/Employment Eligibility Verification Program) is an Internet based system operated by the Department of Homeland Security (DHS) in partnership with the Social Security Administration (SSA) that allows participating employers to electronically verify the employment eligibility of their newly hired employees.

E-Verify is free and voluntary and is the best means available for determining employment eligibility of new hires and the validity of their Social Security Numbers."
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Oh, horrors. You mean the gardener might end up being illegal?