The Immigration Reform and Control Act of 1986 (IRCA) made the knowing employment of unauthorized aliens illegal. With the enactment of IRCA, the legal obligations of employers, hiring new employees have been greatly increased. Employers are required to verify the identity and eligibility for employment of all persons they hire after November 6, 1986.

It is also unlawful for employers to knowingly hire a person who is not authorized to work in the U.S., or continue to employ such a person. Thus, IRCA requires employers to complete a Form I-9 for each new employee within 72 hrs of the employee's start date.

On November 20, 2009 The Department of Homeland Security (DHS) made it mandatory for all federal contractors to use the E-Verify System to check that contractors are legally authorized to work in the United States, making the employment eligibility verification (EEV) process more complicated.

As an E-Verify Designated Agent eSource-HR, LLC simplifies the process by accessing the Department of Homeland Security and the Social Security Administration databases to verify employment eligibility.