Practice of Sharia
Most countries of the Middle East and north Africa maintain a dual system of secular courts and religious courts, in which the religious courts mainly regulate marriage and inheritance. Saudi Arabia and Iran maintain only religious courts for all aspects of jurisprudence. Sharia is also used in Sudan, Libya and for a time in modern Afghanistan. Some states in northern Nigeria have reintroduced Sharia courts.
(For detailed news you can consult the Sharia News Watch [1], that provides a regular update of newsquotes on Sharia & related subjects, organized per country).
In practice the new Sharia courts in Nigeria have most often meant the re-introduction of spectacular and gruesome punishments (such as amputation of one/both hand(s) for theft, or stoning for adultery) without respecting the much tougher rules of evidence and testimony (including the necessity of four eyewitnesses, with women's testimony counting no less than that of a man). Such measures are usually introduced to gain support of local ulema who are often community leaders in rural areas. Their examples are not always humane or even reasonable. Muslim scholars tend to agree that Muhammad himself would not run courts along these lines in an otherwise secular society, nor introduce these punishments into societies rich enough to afford prisons and rehabilitation, cohesive enough to prevent those accused from being killed by outraged victims and communities.
Like Jewish law and Christian canon law, Islamic law has no one, set meaning for all time and places. In the hands of moderates, religious law can be moderate, even liberal. In the hands of post-Englightenment readers of philosophy, religious law is relegated to ritual (as opposed to law in a civil sense), or even to just being history. In the hands of zealots, it becomes legally enforced against all people of a faith, and even against all people that come under their control. Islamic law to American Muslims in Dearborn, Boston, or Houston is a very different thing than Islamic law to religious Muslims in Egypt, Saudi Arabia, the Gaza Strip, western China, Indonesia, or Pakistan. All of them are following Islamic law, yet it varies as much as individual Muslims vary. (As is true for Jews and Christians, etc.)
See also: ulema, ijma, umma, ijtihad, Hadith