Immigrants rights advocates and employers, including farmers, are lashing out at the Supreme Court's May 26 decision upholding Arizona’s right to demand employers use the controversial e-Verify system, which is meant to confirm whether someone is in the country legally.

The decision also allowed Arizona to continue the so-called “business death penalty,” which entails denying a business license to employers found guilty more than once of violating a 2007 law against hiring undocumented workers.

The e-Verify system has been widely criticized for errors, including flagging legal and native-born residents as undocumented. That’s among the reasons Illinois sought to ban its use by private employers. A federal court shot down those efforts, but the Illinois legislature did pass a state law trying to safeguard against the misuse of the system.

All employers with federal contracts are required to use E-Verify, and Texas Republican Congressman Lamar Smith is among those pushing to make it mandatory nationally.