"That is to say, use data-mining techniques to not rummage through everything."
Data mining basically /is/ rummaging through everything.
So although technically data mining is rummaging, it is not on the record and accessible to another person if it is irrelevant.
I like this judge.
It's debatable, I guess, if there is any constitutional violation if a machine performs an unauthorized yet unbiased search of your property. But I think most could agree it's better than a human doing it all themselves.
Not sure that this is great, but baby steps.
He Also Says It's About Mass Surveillance, Not A Specific Technology