Using the powers granted in the FISA Act, what standard of proof must the government meet in order to obtain a warrant to investigate threats of terrorism?

Question

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The Foreign Intelligence Surveillance Act (FISA) allows the government to operate under a more lax standard than what is typically required for criminal investigations when seeking to investigate threats of terrorism. This is designed to facilitate quicker and more flexible responses to national security threats.

Using the Powers Granted in the FISA Act, What Standard