To 'break' the tracability of coins isn't it better to put coins into for instance btc-e, buying usd on btc-e, then buying btc again and withdrawing from the exchange? unless LE has access to the exchange database there is no way to connect the coins to you while traditional tumblers only obfuscate by sending the coins to a lot of addresses but they are still tracable...
what if le subpoenas them for your identity?