Common law is enforceable in any country
You clearly know absolutely nothing about how the legal system in Arab countries works. For a start, it based on the premise that if something happens, it must be your fault as you are the foreigner - if you hadn't been there, it wouldn't have happened etc.
In Arab countries, the law is essentially whatever the Sheiks and mullahs say it is. Same goes for lots of Asian countries too (although you can substitute local politicians/apparatchiks for Sheiks and mullahs).