Watching things like this, I think bitcoin could eventually replace the government-backed currency. Everyone can watch them move. If you spend 1$ from that wallet to buy even a mars bar, your identity will be known to others. How CLEAN and clear is that?
In a way. Washing it is pretty easy though. Send $50 into whatever exchange-du-jour is popular, then withdraw it back out into a clean wallet. Now you can buy all the Mars bars you want.
You leave all your trace. Unlike cash laundering. That’s what matters.