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Part of the problem with this logic is it makes the same assumption that the FISA revisions do. It completely ignores the fact that the third party being searched also has fourth amendment protections.
The gummint isn't required to get warrants for each party to a conversation before tapping phones with a Title 3 tap. All they need is a warrant for the target. If you're unlucky enough to call that person, they can record what you say to him as well.
Cheers,