If according to, http://www.forbes.com/sites/andygreenberg/2013/09/05/follow-the-bitcoins-how-we-got-busted-buying-drugs-on-silk-roads-black-market/ and the tons of other articles done on just how transparent bitcoin really is, along with how that dea officer got busted from blockchain analysis for laundering the bitcoin from silk road, then I'd say:

Bitcoin is 100% tracaeble, much moreso than cash, and in the future when better blockchain analysis programs are made, even transactions that have gone through coinjoin and tumbling dozens of times, will be able to get traced much easier.