For some individuals with potential risks that might be detrimental to the nation, different levels of monitoring are conducted in advance.
If something happens, they will look within that circle.
Although it's not 100% accurate, the probability is very high.
This can minimize the time needed to capture terrorists.
Luke asked, "Can you trace his phone number?"
"No, the phone number is no longer in use."
"What about the address?"
"People like them most likely don't live at the registered address."
Seeing the other party not in a hurry, Luke asked, "Do you have a way to find him?"
"I can't, but I know who can find him."
"OK, then show me how the FBI investigates."
...
Diefka Restaurant.
A black Chevrolet SUV parked near the restaurant.
Luke got out of the car and glanced around. On the roadside stood several men with headscarves, causing him to frown slightly.
