Comparing - Running investigations, police officers being known and trusted "faces" in their community, and surveilling people in meatspace To - Running grep

Comparing - Running investigations, police officers being known and trusted "faces" in their community, and surveilling people in meatspace To - Running grep on every TCP packet of 65 million people, then asking a relatively small number of LEOs to "do something" when analysts see something that could be suspicious The former seems more likely (to me) to succeed.