In episode two of our National Case Closed Project: Supporting Best Practices in Investigation season, Just Science sat down with Fabio Sanchez, Crime Gun Intelligence Sergeant at the City of Miami Police Department, Yaneisy Delgado, Intelligence Analyst at the Miami-Dade Police Department, and Kevin Armbruster, retired Lieutenant with the Milwaukee Police Department, to discuss how their agencies utilize ballistics evidence and cross-agency collaboration to improve gun violence investigations in the greater Miami area. When a fatal or non-fatal shooting occurs, investigators can submit ballistics evidence to the National Integrated Ballistics Information Network, or NIBIN, which will generate potential associations with other firearm cases in the area. Law enforcement agencies in Miami, Florida have developed best practices for utilizing NIBIN and other information-sharing techniques to drastically reduce gun violence rates in one of the largest metropolitan areas in the United States. Listen along as Fabio, Yaneisy, and Kevin describe their agencies’ methods for quickly and effectively entering data into NIBIN, using social media and other analyses to track patterns in case evidence, and the importance of information sharing and collaboration for preventing gun violence. This project is supported by Grant No. 15PBJA-21-GK-04008-JAGP awarded by the Bureau of Justice Assistance. The Bureau of Justice Assistance is a component of the U.S. Department of Justice’s Office of Justice Programs, which also includes the Bureau of Justice Statistics, the National Institute of Justice, the Office of Juvenile Justice and Delinquency Prevention, the Office for Victims of Crime, and the Office of Sex Offender Sentencing, Monitoring, Apprehending, Registering, and Tracking. Points of view or opinions in this document are those of the author and do not necessarily represent the official position or policies of the U.S. Department of Justice.