Connor can't believe Roland would sell out all 400 other kids.
The Juvey-cops believe it, though, because they already know about the Graveyard. This isn't news to them.
When Roland wonders why they don't round the kids up, the cops admit that the Admiral is "doing [them] a favor" (5.50.11)—they don't have to spend the time or labor tracking kids down when they're out of public view.
The Juvey-cops take all three—Connor, Risa, and Roland—away to be unwound.