Dr. Carl Hart on fentanyl: what the evidence says · JRE #1593

What the evidence says 01 / RECORD

Hart's statement that fentanyl is an opioid substantially more potent than heroin is accurate and consistent with data from the National Institute on Drug Abuse, which notes fentanyl is far more potent than morphine or heroin and that as little as 2 mg can be fatal; this potency differential is a documented driver of overdose risk when fentanyl is mistaken for heroin. However, Hart's further conclusion, that a specific decedent's official cause of death was likely incorrect based on toxicology numbers relayed secondhand by a grieving parent, is not something that can be verified from the podcast account alone. Forensic toxicology research shows that postmortem fentanyl (and other drug) concentrations vary widely and substantially overlap between fatal and non-fatal cases, meaning blood levels alone are an unreliable basis for inferring cause of death; medical examiners typically weigh toxicology alongside autopsy findings, scene investigation, and medical history rather than concentration numbers in isolation. Without access to the full autopsy report, investigative findings, and case-specific circumstances, an outside reviewer cannot reliably determine whether a coroner's cause-of-death finding was wrong based on relayed toxicology figures. The potency comparison is well-supported; the cause-of-death reassessment is an unverifiable, overreaching inference from limited secondhand data.