But I think what a good percentage of what people are trying to say in this thread, is that if businesses start incorporating a way to detect if a bitcoin is blacklisted; it would be just as easily detectable and therefore wouldn't make bitcoin fungible... Also you would end up losing a lot of money that way if you yourself didn't incorporate a way to be able to check if the bitcoin you are receiving for payment by someone else is tainted, since in the future it will be more protocol for every bitcoin business to start checking the blacklist to see if the bitcoin they received for a service has been tainted or not.