I think that's a policy question. There's no way to avoid evidence-related issues. There are always people, whether they are police officers or members of the public, who look for the magic bullet, but there isn't one. It always comes down to what you can prove. The prosecution in the Chun case is a good example.
Having studied different cases, I can say that, even with the latest technology, it always comes down to evidence. You have to prove who the person is using the money or assets that you want to seize or freeze.
There are some recent cases, for example, that I was looking at involving bitcoin. It's a new and emerging technology. However, at the end of the day, it's still a question of who the person is on the other end using the computer. How do we establish that?
Some of that is going to be done the old fashioned way. In the cases I'm thinking of, it's about surveillance, for example, so that when the person communicates or does something, we can prove that they did something. Those are the connections that we still have to make. Does the technology pose extra challenges? For sure, it does.
Dark web, bitcoin, and cryptography all pose extra challenges. At the end of the day you have to get the evidence. Intelligence can help. I'm sure the police would tell you that it can help direct them where to investigate, but at the end of the day, you have to have a means to get admissible evidence.