Thanks Pedmar ... good information indeed !
I have read about the fake policemen .. And even when I had police arrive at my apartment from the C17 unit they always will show ID if you ask . Also , in España , police will not normally cross the threshold of you house unless you invite them in ! That´s a rule unless they have good information that you are doing something bad .
I´ve said this many times , but it´s worth repeating .. La policía municipal ( Madrid ) , El Cuerpo nacional de Policía , and the Guardia Civil are fantastic here in the City ... They do an amazing job ! Always polite , always helpful and always efficient . Madrid´s finest !