[couchand]

Well, at the very least the data resides in memory and the CPU cache. We could discuss whether that constitutes "storage" but I do think it's significantly different than the personal memory of a police officer. A more appropriate analogy might be a traffic camera looking for the specific license plate.

EDIT: Note that the purported benefits of these collections programs (according to many of the slides) is that the selectors can be determined after the fact. So they must be keeping data somewhere.