In the episode of The Wire that aired last night on HBO ("That's Got His Own") there was a crossover with Homicide. In the episode last night Junior Bunk from Homicide was mentioned as someone who had once put bad product on the market causing deaths. It is interesting that this (of all things) was the first mention of Homicide in the canon of The Wire (particularly since The Wire had an earlier bad dope story that could have been referenced).
But it was, no doubt, a crossover for our purposes and counts.
So, The Wire will be added to the grid on the next update (which is coming soon I promise (blame me not crossoverman, I'm the hold up)). Making this the first time in at least a year that a show has been added right to the core of the grid instead of out on the fringes.