The investigator, having sufficient ground to suspect that in some premises or in some other place or in possession of some person, there are instruments of crime, articles and valuables acquired by criminal way, as well as other items or documents, which can be significant for the case, conducts a search in order to find and take the latter.
The search can also be conducted to find searched-for persons, persons suspected in crime, and corpses.
The search is conducted only by a court decree.

Source: Iravaban.net