if the official has not performed actions in favor of the bribe-giver

If the person actively contributed to the detection and (or) investigation of a crime and there was extortion of a bribe 

If a person has publicized the fact that he or she has paid a bribe to a large number of persons

If the person, after the commission of the offense, voluntarily informed the body authorized to initiate criminal proceedings about the bribe he/she had given