Two young males were hospitalized with miosis and respiratory dysfunction after exposure to a white powder obtained from a foreign source by mail. A few days later, one of the males was found dead at his home. A serum sample from one of the hospitalized patients and a blood sample from the deceased contained ortho-fluorofentanyl in concentrations of 2.5 and 2.4 ng/mL, respectively. It was concluded that death was caused by ortho-fluorofentanyl.

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