Denial is a reaction often found on step 3 of the Reid technique of police interrogations. The technique often starts with the agent confronting the suspect about the latter's involvement in a case. Using true, or faked, evidence, the interrogator comfortably establishes that he/she believes that the suspect has something to do with what happened. The reaction of the suspect helps determine baseline behaviors.
The second step is when the interrogator lays out the story about what happened, connecting the suspect to the events. Right about now, comes steps 3 which is denial. Denial is the rejection of guilt or association from the case. In this case, what the interrogator does is to prevent the suspect from denying anything. Instead, the interrogator will tell the suspect that he/she can object later. Hence, all consists on rejecting to accept involvement or responsibility.