The needle in the haystack analogy, in that they are only looking at data through complex queries to find the needles, and not looking at data collected from th

The needle in the haystack analogy, in that they are only looking at data through complex queries to find the needles, and not looking at data collected from the public directly, only works if they get no false positives. Are they expecting us to believe they have a perfect system? If so, why collect all the data in the first place and run their queries in real time? The board questioning doesn't have the technical background to ask any challenging questions.