"We have all been reading about the introduction of drug testing into high level chess competition (Over the Board). But now it appears that drug testing will also become part of correspondence chess as well. Following are some of the details that have been leaked by top officials and other functionaries in the elite cc organization International Correspondence Chess Federation (ICCF) as well as some quotes from scientists and medical experts. We are sure to hear more about this in the future, given that drug testing has proven to be so controversial in OTB chess. .........."
If you want to read more about this issue:
http://www.correspondencechess.com/campbell/articles/a030205.htm