Heroin and fentanyl in Dallas County: A 5-year retrospective review of toxicological, seized drug, and demographical data Posted on February 7, 2023February 7, 2023 By Becky Carter Lindsay Glicksberg PhD, Sara K. Dempsey PhD, Brittany K. Casey PhD J Forensic Sci; 68(1); 2023 Access article Chemistry, Crime Scene Investigation and Reconstruction, DREs / Traffic Safety Resource Prosecutors, Forensic Pathology and Medicolegal Death Investigation, Seized Drugs/Controlled Substances, Statistics and Data Analysis, Toxicology