salat prayer by Muslims during prayer times, investigating reports of witchcraft, and other behavior it believes to be commanded or forbidden by Islam. Daily life in Saudi Arabia is dominated by Islamic observance. Five times each day, Muslims are called to prayer from the minarets of mosques scattered throughout the country. Because Friday is the holiest day for Muslims, the weekend begins on Thursday. In accordance with Salafi doctrine, only two religious holidays are publicly recognized, Eid al-Fitr and Eid al-Adha. Celebration of other Islamic holidays, such as the Prophet's birthday and Day of Ashura are tolerated only when celebrated locally and on a small scale. Public observance of non-Islamic religious holidays is prohibited, with the exception of 23 September, which commemorates the unification of the kingdom. Conformity of behavior is highly valued as part of religion, apparent in sameness of dress. Almost all women wear a loose-fitting black abaya cloak covering all but their eyes and hands, almost all men wear a white thawb with a red and white checkered headdress. Sharia, or Islamic law, is the basis of the legal system in Saudi Arabia. It is unique not only compared to Western systems, but also compared to other Muslim countries, as (according to its supporters) the Saudi model is closest to the form of law originally developed when Islam became established in the Arabian peninsula in the 7th century. The Saudi courts impose a number of severe physical punishments. The death penalty can be imposed for a wide range of offences including murder, rape, armed robbery, repeated drug use, apostasy, adultery, witchcraft and sorcery and can be carried out by beheading with a sword, stoning or firing squad, followed by crucifixion. Wahhabism Many of the strict and unique practices in Saudi Arabia mentioned above come from Wahhabism, (formerly) the official and dominant form of Sunni Islam in Saudi Arabia, named after the preacher and scholar Muhammad ibn Abd al-Wahhab. (Proponents consider the name derogatory, preferring the term Salafiyya, after the early Muslims known as the Salaf.) This interpretation is often described as 'puritanical', 'intolerant' or 'ultra-conservative', however proponents believe its teachings seek to purify the practise of Islam of any innovations or practices that deviate from the seventh-century teachings of the Islamic prophet Muhammad and his companions. According to one anti-Wahhabi source (Stephen Schwartz), "no more than" 40% of Saudi nationals consider themselves Wahhabis. The message of the