Roughly 90% of all US paper currency has trace amounts of cocaine on it. If you don't want those bills, I'll gladly take them.
How's that even possible? Are they snorting tons of coke at the money printing factories?
It really does surprise me that you didn't know about this. It happens with most paper currencies.
To add the the argument, if you receive a single satoshi from anyone that got at least a satoshi from somebody who got at least a satoshi (you get the idea) from the FBI, all of your bitcoins at the receiving address will be tainted, not only that single satoshi.