So you see, for some while prior to David Letterman moving to CBS, the network would air a bunch of different shows under the label Crimetime After Primetime each weeknight after the 11pm local news. A different show for each night of the week, and sometimes a show would disappear and be replaced by something else, so there were eventually more than the original 5 series. I can't quite remember the order of all this, anymore. And I'm not sure whether I'm forgetting any series or not. But anyway, all these shows would fit into the legal dramas category.
See also programming blocks