“At a recent forum that brought together government officials and bitcoin entrepreneurs to discuss the future of the cryptocurrency, paeans to the protocol’s efficiency mingled with law enforcement’s concerns about it. Jennifer Shasky Calvery, head of the US Treasury Department’s Financial Crimes Enforcement Network (FinCEN), which is charged with fighting money laundering and terrorist finance, fretted that powerful payment technologies could facilitate bad actors.”
Source: Terrorism Finance Trackers Worry ISIS Already Using Bitcoin – Defense One