In 2004, HAF challenged the public display of the Ten Commandments in Texas, where it appeared as amici curiae (friend of the Court) in "Van Orden v. Perry" in the United States Supreme Court. It argued that the display represented an "inherent government preference" for Judeo-Christian religions over others and the state must be reminded of its obligation to maintain religious neutrality. In 2005, HAF, along with the Buddhist Peace Fellowship, the Association on American Indian Affairs and the Interfaith Alliance, was involved in the "Simpson v. Chesterfield County" case regarding legislative prayer. In 2008, HAF along with a coalition of other religious groups, filed suit and blocked the issuance of Christian themed license plates in South Carolina.