Carfentanil Blood Concentrations in Impaired Driving Investigations in Ontario, Canada Posted on May 19, 2023May 19, 2023 By sdargoltz H Rachelle Wallage, Marie Elliot, James W Rajotte J Anal Tox; 46(8); 2022 Access article Chemistry, Crime Scene Investigation and Reconstruction, DREs / Traffic Safety Resource Prosecutors, Forensic Pathology and Medicolegal Death Investigation, Seized Drugs/Controlled Substances, Toxicology