You pay attention. DASH, Monero and Zcash have been listed in the top 3 crimes altcoin commonly used.
According to Jarek Jacubchek, a security expert at Europol, while Monero uses non-transparent bockchain technology, DASH arranges transactions in a way that no third party monitors the cash flow. . Zcash has special security that prevents access to and control over illegal sources.
Maybe this price of 3 coin will down people to monitor the situation offline.