When emergency room doctors have a system that allows them to cross check their performances, it can lead to a reduction in medical errors, although not all types of errors.
Those results came from a randomized trial that was conducted in France, and involved a total of six emergency departments. Physicians in each of these departments were made to participate in cross-checks three times a day. During these checks, the physicians were required to present their cases to each other, and get feedback on the same. The results found that during the cross-check period, the rate of medical errors dropped to approximately 6.4% of patients who visited the emergency room, compared to 10.7%, during the non-check period during which patients got the standard care without any physician feedback.