Maximilian Popp reports on the dangers of a sub-state justice systems in Germany:
Politicians and social workers tend to focus on forced marriages and honor killings, but the baleful influence of these Islamic arbitrators has gone largely unnoticed by the public.
Joachim Wagner, an author and television journalist of many years, has taken a closer look at the phenomenon in his book "Richter ohne Gesetz" ("Judges without Laws"). Reconstructing Mustafa O.'s case, he reaches the conclusion that "the Islamic parallel justice system is becoming a threat to the constitutional legal system." These justices of the peace don't wear robes. Their courtrooms are mosques or teahouses. They draw their authority not from the law, but from their standing within the community. Most of them are senior members of their families, or imams, and some even fly in from Turkey or Lebanon to resolve disputes. Muslims seek them out when families argue, when daughters take up with nonbelievers or when clans clash. They often trust these arbitrators more than they trust the state.
Eugene Volokh thinks the activities of these courts are criminal.