Arizona’s colleges are still not sure how to comply with Proposition 300, a ballot measure that voters approved in November. The measure prevents students who are not legal residents of the United States from paying cheaper in-state tuition at public colleges, from receiving financial aid from the state, and from taking adult-education courses offered by the Arizona Department of Education.

As classes resume this month, colleges say they still do not know how they will enforce the new law, in particular when they must begin charging undocumented students the out-of-state tuition rates, according to The Arizona Republic. Students who are not legal residents are also scrambling to secure private aid to help them pay the new out-of-state rates, which are at least three times the in-state rates at most of the state’s public colleges.

Shortly after the proposition passed, college officials said they worried that the measure would require them to shift hefty portions of their budgets so they could play backup for the border patrol.