'There is no single ‘lawbook’ for Islamic law that a judge can refer to. Fiqh is a vast collection of different, often competing interpretations of the basic sources, and since the work of interpreting God’s will for humanity is ongoing, there is always new fiqh to be derived. This means it is not at all as rigid and frozen as Islamic law is stereotypically imagined as being. We should also avoid assuming that Muslim–majority countries are ‘applying the shari’a’, even if they claim to be doing so. In fact, the legal systems of such countries tend to contain a mix of Islamic legal principles, local custom, European law derived from the colonial period, and civil law developed since independence.'
-TheOSThinkTank