A study examines reaction-times in deadly force situations, reports ABC-7 Denver.

David Blake, a retired California police officer, and Dr. Edward Cumella, a professor of psychology at Kaplan University, conducted the study to address the impact of fatigue on officers’ performance in deadly force simulations.

For a week, Blake and Cumella’s research examined how a lack of shut-eye impacted 53 officers decision-making and reaction-times when responding to shoot or don’t shoot situations.