Remember that the government has PR people too. Everything is going to be presented in the best possible light. The "think of the children" case is the one they

Remember that the government has PR people too. Everything is going to be presented in the best possible light. The "think of the children" case is the one they're willing to release details on - why do you think that is? Perhaps they chose "late 2006" because earlier in 2006 there were many more, or more egregious cases. "National security cases" is also a nice vague catchall that could encompass everything from Occupy to a single person crossing the border illegally.