The relevance of this is almost zero. Does it matter if you and I both own coins that 10 years ago were both owned by Mt Gox? Is that at all relevant to anything? Everyone will have handled cash at some point which was involved in a crime. What's that old statistic about 75% of bank notes having traces of cocaine on them?
This percentage may be even higher, 90% as far a I know
Quote
https://www.acs.org/pressroom/newsreleases/2009/august/new-study-up-to-90-percent-of-us-paper-money-contains-traces-of-cocaine.html
EMBARGOED FOR RELEASE | August 16, 2009
New study: Up to 90 percent of U.S. paper money contains traces of cocaine
EMBARGOED FOR RELEASE | August 16, 2009
New study: Up to 90 percent of U.S. paper money contains traces of cocaine
However, I believe this is due to the fact that people use drug notes as a tool to consume cocaine
