The Denver Police Department recently agreed to let officers take part in a study of racial bias. Civilians also participated. Ryan Warner speaks with Tracie Keesee a commander with the Denver Police Department, and CU psychology professor Bernadette Park. Try the simulation. [Please be aware that this link is provided for demonstration purposes only. The actual study differs in a number of important ways. The simulation is full screen, audio feedback is provided, a button box is used for responses, and the timing for stimulus presentation is more precise (and in general faster) than what is presented here.] Read the study.