Colorado was the first State to begin using FDS, and is a recognized leader in its promotion and spread across the country. It has developed its own software for conducting FDS, which it shares with multiple States. This software is one of the leading tools for using FDS in the United States. California was also an early adopter of FDS and has successfully solved multiple cases with this tool. California has a statewide policy and also developed its own software for conducting FDS. Unique FDS practices are the institution of an interdisciplinary committee to approve the use of FDS in individual cases and conducting records research prior to release of the profile name to investigators. Wisconsin began conducting FDS in 2014, using the software developed in Denver. Wisconsin has experienced multiple successes in using FDS. Wisconsin's case study provides information on the earlier stages of implementation and how a pilot may be helpful for this process. Maryland is the only State with legislation that explicitly bans the use of FDS. The rationale for this legislation is discussed.