Digital evidence is connected to nearly every modern crime. Author: William Joy (WFAA) Updated: 9:10 PM CDT May 11, 2021 DALLAS — The FBI’s Dallas field office provided a rare look Tuesday inside its lab responsible for digital evidence, an ever-growing part of investigations. “The vast majority of law enforcement cases involve some piece of - a device of some kind that has digital evidence on it,” said Matthew DeSarno, the special agent in charge for the Dallas division. The Regional Computer Forensics Lab or RCFL covers 137 counties in North Texas and assists in Arkansas as well on both federal and local crimes.