Legal psychologists write expert witness reports in court cases. Such reports can affect judges’ and juries’ decisions. Often the reports describe how thinking errors may have biased decision-making at various stages of the criminal justice process. For example, police officers may have been subject to confirmation bias by focusing on evidence supporting their suspicions while ignoring contradictory information. Since biases are fundamentally ingrained in human thinking processes, the question arises whether legal psychologists themselves are also vulnerable to biases. The researchers will analyze real Dutch reports and conduct four experiments to test whether legal psychologists themselves are vulnerable to bias.