Detail:

        Carfentanil or carfentanyl is an analog of the synthetic opioid analgesic fentanyl. A unit of carfentanil is 100 times as potent as the same amount of fentanyl, 5,000 times as potent as a unit of heroin and 10,000 times as potent as a unit of morphine.

        The toxicity of carfentanil in humans and its ready commercial availability has aroused concerns over its potential use as a weapon of mass destruction by rogue nations and terrorist groups.

        Carfentanil was first synthesized in 1974 by a team of chemists at Janssen Pharmaceutica which included Paul Janssen. It is classified as Schedule II under the Controlled Substances Act in the United States with a DEA ACSCN of 9743 and a 2016 annual aggregate manufacturing quota of 19 grams (less than 0.7 oz.).

Increase in illicit use:

        A November 2016 article in Time, "Heroin Is Being Laced With a Terrifying New Substance: What to Know About Carfentanil", reports over 300 cases of overdose related to fentanyl and fentanyl analogues and several deaths connected to the drug since August 2016 in several of the United States, including Ohio, West Virginia, Indiana, Kentucky and Florida. In 2017, a Milwaukee, Wisconsin man died from a carfentanil overdose, likely taken unknowingly with another illegal drug such as heroin or cocaine. Carfentanil is most often taken with heroin or by users who believe they are taking heroin. Carfentanil is added to or sold as heroin because it is less expensive, easier to obtain (until China added it to its list of controlled substances on 1 March 2017, it was legal for Chinese firms to advertise and sell carfentanil over the Internet, offering advice to customers in other countries on how to import it illegally) and easier to make than heroin. Health professionals are increasingly concerned about potential for escalated public health consequences of recreational use.

Potential as a chemical weapon:

        The toxicity of carfentanil has been compared to that of nerve gas, according to the Associated Press' article "Chemical weapon for sale: China's unregulated narcotic". The article quoted Andrew C. Weber, Assistant US Secretary of Defense for Nuclear, Chemical and Biological Defense Programs from 2009 to 2014, as saying "It's a weapon. Companies shouldn't be just sending it to anybody." Weber added "Countries that we are concerned about were interested in using it for offensive purposes... We are also concerned that groups like ISIS could order it commercially." Weber described various ways carfentanil could be used as a weapon, such as knocking troops out and taking them hostage or killing civilians in closed spaces such as train stations.

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