Way more important than residue from the dope is residue from being a known dope smuggling boat. Knew a lovely schooner that was bought at auction and rehabbed. Every where they went they got the full treatment from delayed or refused entry permission or the cops totally tossing the boat. Apparently there is a list of suspected smuggling boats that even a name change won't cure.
Well I bought a drug boat that was sold at auction. It was called Rough Diamond and I did change the name. I cruised it for 7 years on an Atlantic circuit. I got no special treatment at anytime.