http://www.clmr.unsw.edu.au/article/compliance/market-conduct-regulation/mining-block-chain-regulatory-surveillance-bitcoin-and-dangers-digital-currencies

"For AML/CTF regulators, financial intelligence units (FIUs) and law
enforcement agencies, the emergence of crypto-currencies offers a
tantalising opportunity. If the anonymity provided by these networks is in
fact over-stated, they could prove to be an extremely useful law
enforcement tool. Using sophisticated intelligence software and techniques
such as heuristic clustering to "crack the blockchain" could yield a
treasure trove of information on potentially illicit money flows."

thanks to antephialtic on IRC.