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 government must meet the same standard of proof as required to investigate criminal activities in order to obtain a warrant to investigate threats of terrorism under the FISA Act. This means the government must demonstrate probable cause to believe that the target of the investigation is a foreign power or an agent of a foreign power, and that the premises or property to be monitored are being used to further the foreign power's activities.

Using the Powers Granted in the FISA Act, What Standard