So far as I can tell, it is the belief of police forces in several European Nations. It can neither be proven or disproven with available data. Police say there are and politicians say there aren’t. If you weigh the argument on likely truthfulness it leaves politicians at a distinct disadvantage.
If you are insistent on real firsthand research to prove or disprove it, as I said, contact a police officer in a likely area. Cities operating Sharia Courts might be a good starting place.
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