What other ways can you catch a terrorist besides the government checking the usage of the Internet?

Question

What other ways can you catch a terrorist besides the government checking the usage of the Internet?

Answer 1

Wire taps, investigation, information from citizens, suspicious activity reports.

Answer 2

"Amendment IV

The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized."

With a warrant.

Answer 3

By going after them in Afghanistan.

Answer 4

How is checking the internet gonna protect you from terrorism?

Answer 5

Worldwide cooperation + domestic cooperation + political cooperation + law enforcement = pure luck

Answer 6

They had the tools they needed before 9/11 and didn't use them... this is all just smoke and mirrors, imho.