Seriously, since when do we have to investigate the past of our coins/money? Should I buy a dog and hire a dog trainer to check absolutely every banknote that I receive, whether does it has traces of cocaine or not? Since when did that become my duty or anyone's duty? That makes no sense. When I receive cash, that cash can be used by top criminals but does that mean that if there is a trace of their fingerprint on my cash it should get confiscated, I should be left without money and face a jail? C'mon guys.
I'll show you something even worse than that and that is your bank account balance.
You got no way to check whether the bank is using the money in your and other people's accounts to help people do money laundering in return for a fat paycheck.
Although to the government's credit, they know that investigating people solely because the money that they withdrew from the bank has traces of bank-sanctioned money laundering is a waste of time because it was not their fault to begin with.