Quote Originally Posted by Fisherking View Post
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.
It's something reported second hand by media keen to inflame and dramatise. I'm sure they have no problem finding someone with rightist leanings in the British police force to oblige them.

Shariah "courts" are common enough in this country. But are usually just places for religious advice. Orthodox jews have similar.