In the following decades, the term "evolution" was omitted in many biology textbooks, even when the text discusses it.[12] These bans on teaching evolution were overturned by a Supreme Court ruling in Epperson v. Arkansas in 1968.[13] Since 2001, there has been a resurgence of anti-evolution bills, one of which, the Louisiana Science Education Act, was passed. This Act allows public schools to use supplementary material that is critical of the scientific theories such as evolution and global warming in science classrooms.[14]