Fight Illicit Networks and Detect Trafficking Act or the FIND Trafficking Act This bill directs the Government Accountability Office (GAO) to report on the use of virtual currencies and online marketplaces in sex and drug trafficking. The GAO must study topics including how illicit proceeds are transferred into the U.S. banking system, state and non-state actors that benefit from or participate in such activity, preventative efforts from federal and state agencies, and how to use the unique characteristics of virtual currencies to track illicit activity.