I think the better method would be FBIFO (no pun intended) FBIFO = first bad coin in - first out. Presumption is that bad coins are urged to be laundered first

I think the better method would be FBIFO (no pun intended) FBIFO = first bad coin in - first out. Presumption is that bad coins are urged to be laundered first. So even if good and bad are mixing in - the bad ones ought to be first out