The life of mushrooms

Someone asked me to explain what the whole FISA thing is about, which surprised me since she's not a low-information sort of person, so here's the simple version:Amendment IV to the United States Constitution: "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 search