Black powder

Ohio State University Since World War II, the homicide rate in the U.S. has been three to ten times higher than in Canada, Western Europe, and Japan. This, however, has not always been the case. What caused the dramatic change? Dr. Roth discussed how and why rates of different kinds of homicide have varied across time and space over the past 450 years, including an examination of the murder of children by parents or caregivers, intimate partner violence, and homicides among unrelated adults.

Brian Cerchiai discusses a NIJ-supported a study conducted by the Miami-Dade Police Department on the accuracy of fingerprint examiners. The study found that fingerprint examiners make extremely few errors. Even when examiners did not get an independent second opinion about their decisions, they were remarkably accurate. But when decisions were verified by an independent reviewers, examiners had a 0% false positive, or incorrect identification, rate and a 3% false negative, or missed identification, rate.