were those associated with fentanyl and fentanyl analogs (synthetic opioids), which amounted to over 20,000 overdose deaths. (7) According to the United States Department of the Treasury 2015 National Money Laundering Risk Assessment, an estimated $64 billion is generated annually from United States drug trafficking sales. (8) Illegal fentanyl in the United States originates primarily from China, and it is readily available to purchase through online marketplaces. 3. GAO study (a) Study required The Comptroller General of the United States shall conduct a study on how virtual currencies and online marketplaces are used to facilitate sex and drug trafficking. The study shall consider— (1) how online marketplaces, including the dark web, are being used as platforms to buy, sell, or facilitate the financing of goods or services associated with sex trafficking or drug trafficking (specifically, opioids and synthetic opioids, including fentanyl, fentanyl analogs, and any precursor chemicals associated with manufacturing fentanyl or fentanyl analogs) destined for, originating from, or within the United States