I believe some cocaine was found in a vessel that was owned by his father in laws shipping company.

I guess it was an attempted smear from Blankenship : https://www.usatoday.com/story/news/politics/onpolitics/2018/05/01/gop-senate-candidate-don-blankenship-explains-why-he-called-mcconnell-cocaine-mitch/568461002/

I believe some cocaine was found in a vessel that was owned by his father in laws shipping company.