medetomidine, a veterinary sedative, is being found mixed into illicit opioids circulating in jail populations across the us, creating severe withdrawal complications that standard opioid reversal treatments cannot adequately address. this mirrors the earlier pattern of xylazine — another veterinary anesthetic — entering the drug supply, suggesting a systematic shift in how illicit opioids are being adulterated. the carceral setting concentrates both exposure and medical under-response.