In order to establish the trust between citizens and the police, it is particularly important that there are open communication and free access to data concerning the police work in fighting crime. The conduct of members of the police is expected to be transparent to the public, and only in exceptional and justified circumstances to be secret. Therefore, providing citizens with information by the police should be a permanent method to improve their relations. That means well planned, continual and timely providing citizens with information about the work of police members, crime situation and ways to protect them from indictable offences. It is usual that the police inform citizens by giving written and oral reports through the media of mass communication, by publishing some external publications intended for citizens and through contacts with them. Although the principle of transparency of police activities against crime has its undoubted importance to establish trust between citizens and the police, it must be taken into consideration that in some circumstances the police is obliged to limit data access to avoid disadvantageous consequences in the case of their communication to the public. It is the question about information by which communication to the public the police could cause disadvantageous consequences to the interests of the community and to the private interests of concerned persons.