Modern (cashless?) Baltimore?

Hello. I'm from Sweden and we're as close as you can be to a cashless society. I haven't touched cash in almost 10 years. We recently switched bills and I don't think I even seen the new ones.

Our drug dealers have switched over to "swish" which allowes you to just send money via bank accounts easily. Recently there has been court cases that leaked/released the list of people who have given the suspected drug dealer money along with their messages.

How do the modern Baltimore do this? Do the drug dealers just Venmo each other? Have there been any court cases and leaked venmo-lists? Or is cash still a thing?