Employers are required to complete a Form I-9 to verify employment eligibility for all employees hired after November 6, 1986. The U.S. Citizenship and Immigration Services issues the Form I-9.
The U.S. Citizenship and Immigration Services also outlines specific procedures for verifying remote employees for certain employers. This option is only available to “qualified employers” who are participating in E-Verify and are in good standing. This article from Squire Patton Boggs provides more information about the procedures and which employers can use them. Additional information about E-Verify can be found at here.
Note that the Form I-9 for is for all employees, and the remote verification process is available only for employers who participate in E-Verify.