Criminal judges are given a difficult task. They need to reconstruct what happened and decide whether they are convinced somebody committed a criminal offence. The Dutch system of proof gives a judge a free hand when taking this decision: he is free in the valuation of the evidence and needs to be convinced that the crime was committed by the suspect to come to a conviction. This freedom of a judge is just limited by the rules regarding the minimum of proof. The unus testis nullus testis-rule is one of the basic principles in this regard. However, this rule does not apply to police officers. If a police officer witnesses something and writes this down in an official report, this report has probative value and the unus testis nullus testis-rule does not apply. We wonder of the probative value given to an official report is legitimate and whether a decision of the court could be solely based on an official report. Before we get to that, we will first consider the decision scheme of the Court to know which questions the Court has to answer. Thereafter, we will pay special attention to the probative value of an official report.