Criminals can always have an advert posted up with the news if they all rp'ed a lingo maybe that would put the attention of cops out of it. Maybe you guys should start doing it with Weazel news itself, it will be fun. You get to roleplay a lot, like if you think the guy is an undercover cop. You could always roleplay checking all his clothes for wires or any secret recording devices and endless possibilities.
You can create a lingo first, then you're good to go. By lingo I mean, you can write up an advert saying "We're looking for lot of green tea, my mom loves it!" Green tea could be plant, could be weed. You can also use White Sugar for crack, coca cola for cocaine. Like I said, endless possibilities. I like the idea of dark web, but if dark web is used just for lowkey adverts, then nah...