Fuller has made many statements about his support for intelligent design (ID) and authored two books on the subject. In 2005, in the case of "Kitzmiller v. Dover Area School District", he testified on behalf of a local school system in the United States that required the teaching of intelligent design. The decision of the U.S. District Court held that intelligent design was a form of creationism and that its inclusion in the curriculum violated the U.S. Constitution's prohibition on the establishment of religion. The decision repeatedly cited Fuller's testimony to undermine the school system's position. Some of Fuller's critics within the Science and Technology Studies community described his participation in the trial as "naive" and suggested that the field needs further development before it can constructively engage the legal community on the nature of science.