[manfredo]

Isn't the whole goal of tumbling to provide plausible deniability? The goal is to avoid tying the coins earned or used in an illicit activity with the the people involved in those activities. If a drug dealer gets an assassin's coins and vice versa then the goal is still accomplished even though all the coins involved are tainted. The drug dealer's possession of the assassin's coins don't help in building a case against his or her drug dealing operation.

[cwkoss]

True, but being in possession of coins tied to an assassination probably puts you at greater risk of being the subject of a federal investigation than being in possession of drug-related coins.