They don't know because they aren't trying but i'm guessing its basically nearly 100% of the population. Its sort of a mathematical x degree's of separation pro

They don't know because they aren't trying but i'm guessing its basically nearly 100% of the population. Its sort of a mathematical x degree's of separation problem. They monitor a few tens (hundreds?) thousand suspects, the direct contacts of said suspects and maybe or to two levels more. So its what 3-4 degrees of separation? Given that "direct contact" likely also means that anyone found in proximity of the suspects for any length of time and its basically everyone, after all you want to tract the contacts the suspects have with people on the park bench. People forget that "metadata" isn't just phone calls these days, its your cellphone pinging the tower with "I'm at location x" messages every few seconds.