Here are a couple of suggestions, OFSO. As with English, there is more than one way of describing what is basically the same thing. I am not sure which specific phrase would cover it, but try these: полицейское дело (pronunciation politseyskoye delo) or досье полиции (pronunciation dos'ye politsii) Some Russian words are adapted from French (from the days of the Romanovs, when anything French was seen as the height of chic). The word for beach for example is пляж, pronounced as plyazh.
Hope this helps - if not, feel free to PM me.