FBI Dallas Utilizes Investigative Genetic Genealogy to Solve 2024 White Powder Case
November 13, 2026 - FBI Dallas is announcing the identification of an individual responsible for mailing multiple white powder letters from the Dallas area.
The investigation began in February 2024 when a sealed envelope leaking white powder was discovered. In total, seven white powder letters were mailed from the Dallas area. These letters contained white powder and violent threats and were addressed to high level U.S. government officials and/or their family members. Testing determined the powder was not hazardous.
A handwriting assessment concluded that the letters were likely sent from one person. The FBI exhausted all traditional investigative methods to identify the individual and then turned to Investigative Genetic Genealogy (IGG). Through IGG, the FBI identified the perpetrator as William Earl Cade, who had died in April 2026. Investigators believe that Cade acted alone and have not identified any additional suspects.
Since its use of Investigative Genetic Genealogy began in March 2018, the FBI has assisted in solving nearly 250 cases across 30 states. FBI Dallas launched its IGG program in 2020 and has four dedicated teams working directly with our local law enforcement partners to help them solve their cold cases.
FBI Dallas
Media Coordinator
media.dallas@fbi.gov
Source: Federal Bureau of Investigation (FBI)
