I think they are, on a rather minimal level, as I said in my opening remarks.
I am referring to the report according to which less than 1%, or around 1%, of transactions might be related to illicit trade, for those reasons I mentioned earlier: bitcoin transactions can be traced relatively easily. So in and of itself, it is a bad technology for criminal activities, since the transactions made will be archived forever in one of the most solid and secure databases in the world.
So only a very small portion is probably related to crime, sort of like with cash, for example. Cash is basically used for illicit activities, but I don't think a very large portion of cash is related to things like the drug trade or various illicit activities.