Screen through. But it is free for employers. When you take the information from your new hire that you have to collect for Social Security and irs. You have to have their information for your payroll. This enables you to check whether the person you hired is actually telling you the truth about who they are. You enter their name, Social Security number, date of birth. Is match. Es its the number real . Is the person claiming to be in eightyearold . That kind of thing. The purpose is to screen out illegal workers and people with fake ids. It can be fooled, but it is harder to fool then the mickey mouse paperbased system that is mandatory, and about half of other employers loose use. Who runs the system . Homeland security. It pings information against the Social Security administration as well. Checking your name and date of birth. How accurate . It was mandated as a Pilot Program in the 1996 Immigration Law. In the george w. Bush administration it got its current branding as everify.