keep in mind that common sense and law are not the same thing. I think there is no doubt at all that mixes would be considered (and are) money laundering in all cases (A. they structure money over multiple accounts, B. They exist for the sole purpose of obfuscating the source and destination of finances). I think in USA exchangers who don't follow strict guidelines will likely find themselves arrested for money laundering. Buying sending and receiving bitcoins is less to worry about though, mixing is certainly money laundering (for all involved) and running an exchange is also very likely to be considered money laundering unless the exchange is licensed and follows all of the regulations. It would be nice to hear an actual lawyers opinion on these things instead of people merely speculating. I can show a few sources of government officials claiming that bitcoin = money laundering, and there are plenty of cases of centralized e-currencies and exchangers being charged with money laundering, and bitcoin mixing has been called structuring and money laundering by at least one legal analyst (I can't find that link atm but might dig it up later) .... but I can't point to any specific law (other than in regards to structuring) it is also pretty obvious that exchangers lawyers are telling them that the government will consider them as financial exchangers (which they are) and regulate them as such