> You don't ignore section headings when reading laws.
You do when you are interpreting the laws. They're labels that carry as much weight as subsection markers. To say otherwise would imply that the "Patriot Act" by another name would be interpreted differently, or that bullet point "1" is more important that "2".
> nothing in that section discusses granting authority
Correct, it is a direction to those that already have such authority. While I enjoy the legal equivalent to the underhanded C contest as much as the next guy, the events that spawned this legislation make debating the finer points of section headings seem pretty silly.