Students arrived in some Florida public school classrooms this month to find their teachers’ bookshelves wrapped in paper — or entirely barren of books — after district officials launched a review of the texts’ appropriateness under a new state law.

School officials in at least two counties, Manatee and Duval, have directed teachers this month to remove or wrap up their classroom libraries, according to records obtained by The Washington Post. The removals come in response to fresh guidance issued by the Florida Department of Education in mid-January, after the State Board of Education ruled that a law restricting the books a district may possess applies not only to schoolwide libraries but to teachers’ classroom collections, too.

House Bill 1467, which took effect as law in July, mandates that schools’ books be age-appropriate, free from pornography and “suited to student needs.” Books must be approved by a qualified school media specialist, who must undergo a state retraining on book collection. The Education Department did not publish that training until January, leaving school librarians across Florida unable to order books for more than a year.

Breaking the law is a third-degree felony, meaning that a teacher could face up to five years in prison and a $5,000 fine for displaying or giving students a disallowed book.

The efforts to conceal titles in Manatee and Duval have stirred outrage from educators and parents, many of whom shared images of bare wooden shelves or books veiled behind sheets of colored paper. Teachers wrote in Facebook posts and text messages that they are angry and disheartened. District officials in both counties have emphasized that the removals are temporary and will last only until staff can determine whether the titles meet the standards imposed by Florida law.

Michelle Jarrett, president of the Florida Association of Supervisors of Media, which assists school library administrators and programs statewide, said that “closing and covering up classroom libraries does nothing to ensure Florida’s students remain on track for reading success.”