A top U.S. Secret Service official on Wednesday asked Congress for help in preventing cryptocurrencies like Monero and Zcash, which provide users with enhanced privacy and anonymity features, from being used for illicit purposes.
“We should ... consider additional legislative or regulatory actions to address potential challenges related to anonymity-enhanced cryptocurrencies,†Robert Novy, deputy assistant director in the U.S. Secret Service’s Office of Investigations, wrote in his written testimony to Congress.
He raised similar concerns about other services like tumblers and mixers that are designed to obscure transactions on blockchains.
https://www.forbes.com/sites/astanley/2018/06/20/u-s-secret-service-action-needed-to-address-anonymous-cryptocurrencies/#53330cc33ca1