Texas is asking public colleges and universities to identify which of their students are living in the country illegally so they can start paying out-of-state tuition, as required by a court ruling earlier this month, demonstrating how undocumented students are in limbo.

In a letter to college presidents last week, Texas Higher Education Coordinating Board Commissioner Wynn Rosser said undocumented students who have been paying in-state tuition will need to see tuition adjustments for the fall semester. A spokesperson for the agency said it has no plans to provide further guidance on how schools can go about identifying undocumented students.

“The real lack of legal clarity just leaves institutions again having to come up with their own process,” said Kasey Corpus, the southern policy and advocacy manager of Young Invincibles, a group that advocates for policies that benefit young adults in the state.

Undocumented students who have been living in Texas for some time lost their eligibility for in-state tuition soon after the U.S. Department of Justice sued the state over the Texas Dream Act, a 2001 state law that allowed those students to qualify for the lower tuition rates at public universities. The state quickly asked the court to side with the feds and find that the law was unconstitutional. U.S. District Judge Reed O’Connor did just that, blocking the law.

It’s unclear if any Texas university already knows which of its students are undocumented. Students do not have to provide proof of citizenship or disclose their Social Security number to apply for college. And colleges rarely track the citizenship status of students who are not here on a visa, said Melanie Gottlieb, the executive director of the American Association of Collegiate Registrars and Admissions Officers.

“There is not a simple way for an institution to determine if a person is undocumented,” said Gottlieb. “It’s a challenging question.”

Read the full article about undocumented students' tuition by Sneha Dey at The Texas Tribune.